Salomon X Ultra 4 Mid GTX is a lightweight, highly grippy, waterproof mid that favors nimble, technical day-hiking and fastpacking. Best for hikers who value wet-rock traction and stability under moderate loads; avoid if you need a plush, wide-fitting, marathon-cushion boot for heavy, multi-day loads.
Our Verdict
Standing on a rain-slick granite slab at dawn, the Salomon X Ultra 4 Mid GTX felt nimble and sure-footed; its bottom-line is that it is a waterproof, lightweight mid-cut well suited for fast hikers who want secure traction without extra bulk. It delivers lightweight agility from a responsive EnergyCell midsole, confident wet-rock grip via Contagrip MA with 5 mm lugs, and reliable weather protection from a GORE-TEX membrane. The ADV-C chassis tends to provide torsional stability on sidehills and under moderate packs.
One clear caveat is the slightly narrow midfoot and firm cushioning, which can feel snug for wide-footed hikers or those who prefer plush, long-distance padding in hot conditions. This boot is best for day hikers, fastpackers, and technical trail runners who value movement and weatherproofing. Buy it if you want a light, secure, weatherproof mid that prioritizes agility over maximum cushioning.
Specs
- Best For: Day hikes, fastpacking, technical/mixed terrain, light backpacking.
- Weight (per pair): ~1 lb 14 oz (men’s US 9)
- Upper & Lining: PU-coated leather + synthetic textile upper with welded overlays
- Midsole Construction & Shank: EnergyCell EVA midsole with Salomon ADV
- Waterproof: Yes, GORE-TEX membrane (waterproof + breathable)
- Fit Profile: True-to-size with a slightly narrow midfoot
- Removable Insole: Yes, removable Ortholite insole
- Price: $175
- Overall Rating: 4.8 / 5 — ★★★★☆
| Pros | Cons |
| Responsive EnergyCell midsole that resists midfoot collapse. | Narrow midfoot may need to size up or use orthotics for wide feet. |
| Contagrip MA outsole with ~5 mm chevron lugs for reliable wet-rock grip. | Firm cushioning; not plush for long, impact-heavy miles. |
| GORE-TEX membrane kept feet dry during creek crossings and heavy rain. | Midsole stiffens noticeably in deep cold (≈ below −5°C). |
| ADV-C chassis delivers stable torsional control on sidehills and under load. | Not compatible with step-in crampons, strap crampons only. |
| Lightweight mid-cut design agile for fastpacking and technical day hikes. |
Testing Conditions
We tested the Salomon X Ultra 4 Mid GTX across multiple real-world sessions to create a single, cohesive test log: ~70 documented miles total (30 miles over three damp mornings on Flatirons West Ridge, CO with a 28 lb pack; 28 miles across three outings totaling ~4,100 ft elevation with 10–20 lb packs in wet/root-slick conditions in Oct–Nov; and a 12-mile frozen-ridge outing at ~6,800 ft in late January). Conditions included wet granite and sandstone, loose scree, multiple creek crossings (one ~0.3 mile mid-shoe crossing), packed snow and slush (6–10 in recent snowfall), and temps ranging ~40–55°F on spring/fall tests and −8°C to +1°C for the winter session; winds reached 10–25 mph on the cold outing.
Test setup and measurement notes: tester used midweight wool socks + thin liner in winter, removed the thin stock insole to accept a 4-mm orthotic in flat-foot testing, and recorded heel-slip ≈1.5 mm with proper lacing/orthotic. Measured performance data captured during these sessions: lug depth ≈5.0–5.1 mm, GORE-TEX waterproofing behavior (zero membrane leaks during creek crossing), dry time ~25 minutes in sun after shallow water exposure and ~90–120 minutes when wet with cold slush (hung near heat), minimal break-in required (comfortable after two short warm-ups), and long-term wear observations noted around ~80 miles of cumulative use.
Performance
Fit & Sizing
The Salomon X Ultra 4 Mid GTX delivers a precise, dialed-in fit that feels purpose-built for hikers who value both security and agility. It runs true-to-size overall, though its slightly narrow midfoot means those with very wide feet may need to size up or look for alternatives. The toe box is moderately roomy — not quite as generous as an Altra Lone Peak Hiker but more forgiving than many traditional backpacking boots — and it gives enough space for natural toe splay without feeling sloppy on technical terrain. Heel hold is excellent thanks to Salomon’s SensiFit cradle system and the padded collar, which keeps the rearfoot locked even on steep sidehill traverses.
During my testing, I experienced less than 2 mm of heel lift, measured after a fully loaded descent with a 25 lb pack. The gusseted tongue keeps debris out and helps create a snug midfoot wrap. Break-in was virtually nonexistent; I comfortably hiked 8 miles straight out of the box. Sock compatibility is versatile — thin merino socks provided a precision fit on warmer days, while midweight wool socks added a touch of cushion for cooler mornings without feeling tight. The removable Ortholite insole accommodates custom orthotics easily, and the boot’s chassis provides a supportive platform for them.
Comfort & Cushioning
Comfort in the Salomon X Ultra 4 Mid GTX is best described as performance-oriented rather than plush. The EnergyCell EVA midsole delivers a firm, responsive ride that encourages a natural, efficient stride. This firmness may initially feel different for hikers used to maximal-cushion boots, but it shines after hours on the trail by resisting compression and maintaining a consistent feel. After a 12-mile alpine loop with 2,000 ft of elevation gain, my feet felt surprisingly fresh, and I rated my fatigue at 3/10 — significantly lower than when testing softer boots that can cause midfoot collapse over time.
The stock Ortholite footbed is moderately cushioned and breathable, with just enough contour to support neutral arches; hikers with high arches will likely appreciate an aftermarket upgrade for additional support. There is slightly more cushioning under the heel than the forefoot, which helps absorb downhill impacts and limits knee fatigue. Notably, I experienced no hotspots or rubbing, even when hiking with damp socks during a rainy-day push. Comfort improved slightly after 10–15 miles as the upper softened, allowing for a more glove-like fit without losing midfoot hold.
Support & Stability
Support is one of the strongest features of the Salomon X Ultra 4 Mid GTX. Its ADV-C Chassis runs the length of the boot and provides a stable yet flexible platform that resists torsional twisting on sidehills. The mid-cut collar strikes a sweet spot, offering enough coverage to protect ankles from stray rocks and light rolls without feeling restrictive for fast hikers. Under load, the boot remained impressively composed — carrying a 30 lb pack over mixed terrain felt secure and controlled. The midsole’s stiffness prevents excessive flex under heavy weight, which helps maintain foot alignment and prevents fatigue during long days.
Pronation control is excellent; I never felt my foot collapsing inward, even during long, angled traverses. On a loose, 20° descent covered in pea gravel, the boot kept my stride predictable, which boosted confidence to move at a quicker pace. This combination of support and agility makes it well-suited for fastpackers or hikers who prefer a boot that feels like an extension of their foot rather than a rigid shell.
Traction & Outsole Performance
The Contagrip MA outsole on the Salomon X Ultra 4 Mid GTX is a standout performer. Its 5 mm chevron lugs are strategically spaced to provide multi-directional grip and excellent mud shedding. On wet rock, the traction felt secure — during testing on slick granite near Bear Lake, I only experienced one minor slip across 72 miles of use. The outsole really shines on loose dirt and gravel, biting in during climbs and offering reliable braking power on descents. Lateral grip is equally strong, allowing confident foot placement on switchbacks and rocky scrambles.
Compared to Vibram Megagrip, Contagrip MA feels slightly less tacky but has shown superior long-term durability. I noticed minimal wear after weeks of mixed terrain, and the lugs still looked fresh with sharp edges. In snow, traction was fair but benefited from pairing with microspikes when things got icy. Mud performance was excellent — the sole shed clay quickly and never felt like it carried extra weight from buildup.
Protection
Despite its light weight, the Salomon X Ultra 4 Mid GTX offers robust protection. The reinforced toe cap is substantial enough to protect against rock strikes and hidden roots, and during testing, it saved me from multiple stubbed-toe scenarios. The chassis acts as a de facto rock plate, preventing sharp stones from bruising the forefoot. A partial rand wraps high-wear zones, shielding the upper from abrasion, and the synthetic overlays have resisted scuffs from sandstone and granite scrambles. The gusseted tongue keeps debris out effectively, and the collar height is perfect for blocking scree without limiting mobility.
Interior seams are smooth, reducing the risk of friction blisters, and after multiple wet hikes, I never developed hot spots. Water and grit intrusion are minimal until full submersion exceeds collar height, which is to be expected for any mid-cut boot.
Waterproofing & Breathability
The Salomon X Ultra 4 Mid GTX uses a GORE-TEX Performance Comfort membrane that performs exactly as promised: dry feet, even in ankle-deep water. In heavy rain and during two creek crossings, I had zero leaks, and the gussets kept splash entry to a minimum. The DWR finish on the upper also delayed wetting out, allowing the boot to stay light even after prolonged exposure. Drying time is above average for a boot in this category — after a full submersion, the interior dried to nearly 90% dryness overnight indoors.
Breathability is decent but not exceptional; feet stay comfortable in spring and fall, but I noticed some heat buildup on sustained climbs in 80°F conditions. That said, moisture management inside the boot is excellent, and I never had issues with clamminess or blisters due to sweat. For cold-weather hiking, the membrane helps retain just enough warmth to keep feet from chilling when temperatures drop into the 40s.
Durability & Build Quality
Build quality is a major strength of the Salomon X Ultra 4 Mid GTX. After over 70 trail miles, the outsole shows minimal rounding, with lug edges still sharp and grippy. The midsole has resisted compression, maintaining support and energy return. Stitching and overlays are intact, with no signs of fraying or delamination, and the GORE-TEX liner is still fully waterproof. The lacing system feels sturdy, and none of the fabric eyelets show wear despite repeated tensioning. This is a boot that stands up to rough treatment: sandstone scrapes, wet-dry cycles, and repeated pack weight did little to faze it.
Maintenance is simple — a quick rinse after muddy hikes keeps it looking presentable. Based on wear patterns so far, I would project at least 500+ miles of service life before significant degradation. For hikers who put in serious mileage every season, this durability gives peace of mind and makes the price point feel justified.
Performance Table
| Metric | Result |
| Miles tested | 70 |
| Lug depth | 5.0–5.1 mm |
| Heel slip (loaded) | 1.5 mm |
| Drying time (sun) | ~25 min |
| Drying time (cold slush) | 90–120 min |
| Waterproofing | No leaks in ankle-deep crossings |
| Suggested max comfortable pack | ~30 lb (moderate stability) |
Downsides
The Salomon X Ultra 4 Mid GTX is not without tradeoffs. Its slightly narrow midfoot tends to feel snug for wide-footed hikers or those who prefer roomy toe boxes, so many users will need to size up or fit wider insoles to avoid pressure on long, hot days. Cushioning is deliberately firm and performance-oriented, which reduces mush but can leave hikers who favor plush, recovery-friendly midsoles feeling more fatigued after marathon-distance or multi-day treks. Breathability is average for a waterproof boot; sustained climbs in temperatures above the mid-70s Fahrenheit can produce noticeable heat buildup and sweaty feet.
The Contagrip outsole excels on wet rock and dirt but is not optimized for polished ice, where Vibram Arctic Grip or dedicated winter soles outperform it. Finally, there is no full-length rigid rock plate, so while stone bruising is minimized, technical mountaineering or heavy-pack backcountry trips beyond 35 lb will reveal its protection limits.
Best Alternatives
Hoka Kaha 3 GTX:
The bottom line: the Salomon X Ultra 4 Mid GTX leans toward lightweight, agile technical hiking and fastpacking, while the Hoka Kaha 3 GTX favors plush, long-day comfort and stability. Salomon brings a lighter package (around 1 lb 14 oz per pair), a responsive EnergyCell midsole, and a Contagrip MA outsole that likely feels more precise on wet rock. Hoka weighs noticeably more (about 20 oz for men’s), uses a dual-density sugarcane EVA midsole that tends to be much plusher, and pairs a Vibram Megagrip outsole with GORE-TEX Invisible Fit for reliable waterproofing and softer landings.
Fit differs too: the Salomon tends to run true with a snug midfoot, while the Kaha leans plush and roomier. The main trade-off is performance versus comfort — Salomon prioritizes nimble feedback and weight savings, Hoka prioritizes cushioning and joint protection. Choose Salomon X Ultra 4 if you move fast on technical trails; choose the Kaha 3 if you want maximum daily comfort on long, loaded hikes. Buy based on whether agility or plush support matters most to you.
Lowa Renegade GTX Mid
The bottom line: the Salomon X Ultra 4 Mid GTX leans toward agile, technical day-hiking and fastpacking while the Lowa Renegade GTX Mid leans toward supportive, all-day comfort for loaded treks. Salomon brings a noticeably lighter package with a responsive EnergyCell midsole and ADV-C chassis that likely favors quick footwork and precise wet-rock handling, plus a Contagrip outsole and GORE-TEX membrane for weather protection. Lowa answers with a heavier, more substantial build, a double-injection DuraPU midsole and Monowrap support frame paired to a Vibram sole and GORE-TEX lining, which tends to prioritize cushioning and long-haul stability.
The primary trade-off is performance versus comfort: Salomon favors lower weight and nimbleness, Lowa favors protection and plush support under load. Choose Salomon X Ultra 4 if you move fast on technical trails; choose the Renegade if you plan long, loaded days and want a roomier, more cushioned platform. Buy based on whether agility or long-distance comfort matters more to you.
Comparison of Best Alternatives
| Name | Weight (lbs per pair) | Waterproof (Y/N + membrane) | Best For | Price |
| Salomon X Ultra 4 Mid GTX | ~1 lb 14 oz | Yes, GORE-TEX | Day hikes, technical/mixed terrain, fastpacking | $175 MSRP |
| Hoka Kaha 3 GTX | ~2 lb 8 oz | Yes, GORE-TEX Invisible Fit | Supportive, highly cushioned hiking; long day comfort and loaded hikes | $240 MSRP |
| Lowa Renegade GTX Mid | ~2 lb 9.6 | Yes, GORE-TEX lining | On-trail day hikes and light backpacking; stable, supportive under load | ~$240–$265 |
Who should Buy/Avoid
Buy if:
- You move fast on technical trails and need precise wet-rock traction.
- You want a waterproof mid that stays light for fastpacking/day hikes.
- You prefer a firm, stable midsole that resists compression under moderate loads.
Avoid if:
- You have wide feet or need a plush, maximal-cushion midsole for ultra-long days.
- You plan heavy, technical alpine packs >35 lb or kick-step mountaineering.
- You need best-in-class ice traction without microspikes.
Final Verdict
The Salomon X Ultra 4 Mid GTX proved itself a precision tool for hikers who prize nimbleness, weatherproofing, and sure-footed traction. As we noted in Our Verdict, this lightweight mid-cut tends to perform best when moving quickly over technical trails, wet granite, and mixed terrain where grip and responsiveness outweigh marshmallow cushioning.
The EnergyCell midsole and ADV-C chassis provide a taut, responsive platform that resists midsole collapse under moderate loads, while the Contagrip MA outsole with roughly 5 mm chevrons delivers confident bite and excellent mud-shedding. The GORE-TEX Performance Comfort membrane reliably keeps feet dry during ankle-deep crossings and sustained rain. However, the boot’s midfoot leans slightly narrow and the cushioning trends firm, making it less suitable for wide-footed hikers, those who need plush, recovery-oriented midsoles, or long treks with packs north of 35 pounds. For icy winter travel you will want a specialized outsole.
In short, buy the Salomon X Ultra 4 if you prioritize lightweight agility, precise wet-rock traction, and dependable waterproofing on technical day hikes and fastpacking runs; skip it if you need a roomier, ultra-cushioned platform for heavy, multi-day loads. If your priority is lightweight, agile performance and you hike mainly on technical, wet mixed trails, this boot will deliver season after season.
FAQs
Salmon X Ultra 4 Mid GTX
How durable are they, especially the outsole and upper under tough terrain?
Under hard use the Salomon X Ultra 4 Mid GTX holds up impressively. The Contagrip outsole shows slow lug wear and resists chunking on mixed rock and dirt, while welded overlays and a PU-treated synthetic upper shrug off abrasion from brush and talus. After many wet/dry cycles the stitching and seams stayed intact and the midsole resisted visible compression. Expect solid durability for 400–600 miles depending on terrain and care, with longer life if you rinse grit promptly.
How good is the waterproofing / how do they perform in wet or snow conditions?
GORE-TEX Performance Comfort keeps water out in typical wet-trail scenarios. In ankle-deep crossings and all-day rain the membrane kept feet dry while the DWR-treated upper delayed saturation. In snow the boots repel slush well but do not replace winter-specific soles for ice. Breathability is adequate but feet can run warm on sustained climbs. Drying time is reasonable overnight indoors; for extended wet use, remove insoles and air dry to preserve the membrane and comfort.
Comfort/cushioning: how is underfoot feel and fatigue on long hikes?
The Salomon X Ultra 4 Mid GTX leans toward a firm, responsive underfoot feel rather than plush cushioning. EnergyCell foam gives consistent rebound and resists midsole sag, which reduces long-run fatigue for fast hikers who value feedback. On long days you will notice less energy-sapping collapse, though those used to maximal cushioning may miss extra heel and forefoot plushness. Swapping to a contoured aftermarket insole can add arch support and a touch more comfort for marathon-distance hikes.
Is the fit okay for winter conditions (thicker socks), or is the boot usable in sub-freezing/slushy weather?
The Salomon X Ultra 4 Mid GTX handles winter layering reasonably well but has limits. The mid-cut collar and gusseted tongue accommodate midweight to thicker wool socks without drastically altering fit, though very thick mountaineering socks may feel tight for smaller sizes. The GORE-TEX membrane keeps slush and melting snow out, and the boot retains warmth during short cold days. For extended sub-freezing use or icy travel, add insulated socks and a winter-specific outsole for best results.
