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Merrell Size Guide
Merrell Size Guide — Shoes
Merrell is an American brand founded in 1981 in Rockford (Michigan) by Clark Matis, Randy Merrell, and John Schweizer. Specializing in outdoor footwear, Merrell is today the best-selling hiking brand in the world, particularly thanks to its Moab range ("Mother Of All Boots"). It offers collections for hiking, trail running, alpine approaches, and everyday wear.
Sources: official Merrell size charts (merrell.com/FR), PRFO Sports, HAVN Store, The Run Hub — official EU/UK/US/cm correspondences.
Alpinstore Return Prevention Tips
- Merrell generally runs small compared to European standards. Many users find they need to take a half size or even a full size larger than their usual size, especially in the Moab range and hiking shoes.
- Agility Peak 6: runs slightly large according to field testers. Your usual size or a half size down.
- For hiking: always allow 1 to 1.5 cm of space between the tip of your foot and the longest toe. Feet swell during exertion and on long descents.
- Wide Version (2E): available on Moab 3, Moab Speed 2, Siren, Nova. If you have a wide foot or a wide forefoot, the Wide version is highly recommended to avoid chafing and blisters.
- Barefoot models (Trail Glove, Vapor Glove): wear your exact size — these models do not accommodate extra space.
1. Size Chart — Men
Source: official Merrell size chart. The cm corresponds to the length of the foot (in mm in the Japanese JP system). EU = European size displayed on the Merrell box.
| EU | US Men | UK | Foot Length (cm) |
|---|---|---|---|
| 37.5 | 5 | 4.5 | 23.0 |
| 38 | 5.5 | 5 | 23.5 |
| 38.5 | 6 | 5.5 | 24.0 |
| 39 | 6.5 | 6 | 24.5 |
| 40 | 7 | 6.5 | 25.0 |
| 40.5 | 7.5 | 7 | 25.5 |
| 41 | 8 | 7.5 | 26.0 |
| 42 | 8.5 | 8 | 26.5 |
| 42.5 | 9 | 8.5 | 27.0 |
| 43 | 9.5 | 9 | 27.5 |
| 44 | 10 | 9.5 | 28.0 |
| 44.5 | 10.5 | 10 | 28.5 |
| 45 | 11 | 10.5 | 29.0 |
| 46 | 11.5 | 11 | 29.5 |
| 46.5 | 12 | 11.5 | 30.0 |
| 47 | 12.5 | 12 | 30.5 |
| 48 | 13 | 12.5 | 31.0 |
2. Size Chart — Women
Source: official Merrell size chart. Women's models start at EU 35 and go up to EU 43 depending on the model.
| EU | US Women | UK | Foot Length (cm) |
|---|---|---|---|
| 35 | 5 | 2.5 | 22.0 |
| 35.5 | 5.5 | 3 | 22.5 |
| 36 | 6 | 3.5 | 23.0 |
| 37 | 6.5 | 4 | 23.5 |
| 37.5 | 7 | 4.5 | 24.0 |
| 38 | 7.5 | 5 | 24.5 |
| 38.5 | 8 | 5.5 | 25.0 |
| 39 | 8.5 | 6 | 25.5 |
| 40 | 9 | 6.5 | 26.0 |
| 40.5 | 9.5 | 7 | 26.5 |
| 41 | 10 | 7.5 | 27.0 |
| 42 | 10.5 | 8 | 27.5 |
| 42.5 | 11 | 8.5 | 28.0 |
| 43 | 11.5 | 9 | 28.5 |
Merrell specifies that it is not possible to directly convert a men's size to a women's size: each foot is unique. Merrell women's sizes start at EU 35 and generally go up to EU 43 depending on the model.
3. How to Measure Your Foot
Foot Length
Place your foot flat on a sheet of paper, heel against a wall. Mark the tip of the longest toe with a pencil. Measure the distance between the wall and the mark. Repeat on both feet and keep the largest measurement.
Foot Width
Measure the width at the forefoot (the widest part). If your width is significantly above average for your foot length, consider a Wide (2E) version available on some Merrell models.
Recommended Toe Space
For hiking and trail running, Merrell recommends 1 to 1.5 cm of space between the longest toe and the front of the shoe. This space is essential for long descents where the foot moves forward in the shoe.
When to Measure
Always measure at the end of the day or after a walk, when the foot is slightly swollen. Wear the socks you will use with the shoes. Measure both feet (they often differ by a few mm).
4. Merrell Range — Usage Guide and Sizing Tips
| Range / Model | Usage | Sizing Advice | Wide Available |
|---|---|---|---|
| Moab 3 / Moab Speed | Versatile hiking, all conditions | Take +0.5 to +1 size — runs notably small | Yes (2E) |
| MQM / MQM Flex | Alpine approach, mixed trail-hiking | Take +0.5 size recommended | No |
| Agility Peak 6 | Versatile trail, technical terrains, Vibram sole | Usual size or -0.5 (runs slightly large) | No |
| SpeedARC Matis | Dynamic trail, energy return, long distances | Usual size | No |
| MTL Long Sky / MTL MQM | Ultra-technical trail, elite performance (Merrell Test Lab) | Usual size — very precise fit | No |
| Siren / Nova (women) | Women's hiking, day and multi-day comfort | Take +0.5 size recommended | Yes (some) |
| Trail Glove / Vapor Glove | Minimalist barefoot, natural running, lightweight trail | Exact size — no extra space to accommodate | No |
| Encore / Jungle Moc | Everyday, slip-on, urban comfort | Usual size — relaxed fit | No |
| Thermo Rogue (winter) | Winter hiking, insulation, snow | Take +0.5 to +1 size depending on sock thickness | No |
5. Merrell Technologies and Soles
M-Select GRIP
Proprietary Merrell sole. Made of recycled rubber and high-traction rubber. Versatile on various terrains (trail, wet grass, mud). Standard on Moab, Siren, Nova.
Vibram Megagrip
Vibram sole with high rubber content. Exceptional grip on wet rock and technical terrains. Used on Agility Peak 6, SpeedARC Matis, MQM, MTL. Reference for outdoor soles.
Gore-Tex / M-Select DRY
Gore-Tex: breathable waterproof membrane of reference. Maximum protection in sustained rain. M-Select DRY: Merrell waterproof membrane, adequate protection, better breathability, and more accessible price.
M-Select FRESH
Antibacterial treatment of the insole reducing odors. Standard on most Merrell models. The treatment renews with washing using the latest M-Select FRESH technologies.
M-Select WARM
Thermal insulation 200g for winter models (Thermo Rogue, Thermo Cross). Keeps warmth up to -32°C depending on the models. Designed to keep the foot warm without adding excessive weight.
FloatPro / MTL Foam
High-performance cushioning foams. FloatPro on Agility Peak 6: EVA+TPU foam, lightweight and dynamic. MTL Foam on SpeedARC: maximum energy return for elite runners.
6. Merrell Size FAQ
Does Merrell really run small?
Yes, this is the most frequent feedback from European users, especially on the Moab range. Merrell shoes are designed on American lasts that tend to be slightly shorter and narrower than European standards. The general rule is to take a half size to a full size larger than your usual size in European brands (Salewa, Scarpa, Lowa…). This is less true for trail models (Agility Peak, MTL) which tend to fit true to size.
What is the difference between Moab 3, Moab Speed, and Moab FST?
Moab 3: the classic hiking shoe, mid-cut available, robust construction, EVA, M-Select GRIP. Versatile and accessible shoe. Moab Speed: a more dynamic and lightweight version, Vibram Megagrip sole, closer to trail, less rigid than the Moab 3. Perfect for fast hikes. Moab FST: version with M-Select DRY membrane integrated directly into the mesh (Fast and Stable), without a separate inner sleeve — better breathability compared to a standard Gore-Tex.
When to choose the Wide version?
If you have a wide forefoot, wide toes, or if your current shoes pinch your toes without being too short, the Wide (2E) version is for you. Available on Moab 3, Moab Speed 2, and some Siren and Nova models. The Wide version maintains the same length as the standard version: do not go up a size from the Wide, as it would be counterproductive.
What is the difference between the Moab and the Agility Peak for trail?
The Moab is primarily a solid and comfortable hiking shoe, suitable for well-marked trails, prioritizing comfort and protection. The Agility Peak 6 is a true trail shoe: Vibram Megagrip sole for technical and wet terrains, more dynamic FloatPro foam, lower drop (6 mm vs 12 mm on Moab 3), more precise shape. If you run or hike fast on technical terrain, the Agility Peak is the right choice. If you seek comfort for multi-day outings with a load, the Moab 3 remains the reference.
Gore-Tex or M-Select DRY?
Gore-Tex (GTX) is the most performant waterproof membrane on the market: almost absolute protection in sustained rain, large streams, wet snow. Its downside is slightly reduced breathability and an additional price. M-Select DRY is Merrell's proprietary membrane, more breathable in warm weather, very suitable for summer hiking in the mountains with showers. For winter or very wet conditions, prefer Gore-Tex. For alpine summers with some showers, M-Select DRY is often sufficient and more comfortable.
Merrell size charts based on official grids (sources: merrell.com/FR, PRFO Sports, HAVN Store). The cm corresponds to the exact length of the foot (not the interior length of the shoe). Merrell recommends measuring both feet at the end of the day and choosing based on the larger foot.
