How to choose trail running shoes: the complete guide

Trail running shoes are your most important piece of gear as a trail runner. A poor choice can lead to blisters, joint pain, or even serious injuries. But with the multitude of models available, how do you navigate the options? This guide covers every criterion to find your perfect pair.

Trail vs road: what's the difference?

A trail shoe differs from a road shoe in several ways: a lugged outsole for grip on loose terrain, reinforced toe protection (rock plate/bumper), an upper that's more resistant to vegetation abrasion, and often firmer cushioning for stability on uneven ground.

The essential criteria

1. Grip

This is criterion number one. Outsole lugs vary in depth (2 to 8 mm), shape and spacing:

Short lugs (2-4 mm): suited for dry, compact and rocky trails. Good versatility on dry terrain.

Deep lugs (5-8 mm): essential for mud, wet grass and highly technical terrain. Wider spacing helps mud evacuate.

Soft rubber (Vibram Megagrip, Contagrip MA): excellent grip on wet rock. Wears faster on pavement.

Hard rubber: more durable, suited for dry rocky terrain, less effective on smooth wet surfaces.

2. Cushioning

The thickness and type of midsole foam affect comfort and protection:

Generous cushioning (stack 25-35 mm): comfortable for long distances (ultra-trail), absorbs impacts well on rocky ground. May reduce proprioception.

Moderate cushioning (stack 18-25 mm): a good balance for medium trails (20-50 km). Versatile and reasonably stable.

Minimal cushioning (stack <18 mm): for light, experienced runners seeking maximum ground feel. Requires good muscular adaptation.

3. Drop

Drop is the height difference between the heel and forefoot. In trail shoes, it typically ranges from 0 to 10 mm:

High drop (8-10 mm): encourages heel striking, more comfortable for runners used to traditional road shoes.

Medium drop (4-6 mm): the most popular compromise in trail running. Encourages a midfoot strike.

Low drop (0-4 mm): promotes a natural forefoot strike. Requires a gradual transition to avoid Achilles tendon and calf injuries.

4. Protection

A toe bumper protects toes against roots and rocks. A rock plate in the midsole prevents sharp objects from penetrating through. Both are essential on technical, rocky terrain.

5. Fit and last shape

The foot should be held securely side to side without being squeezed. On descents, toes should not touch the front of the shoe — leave roughly a thumb's width of room. Each brand has its own last shape:

Wide foot: Altra (very wide toe box, zero-drop), Topo Athletic, some Hoka models.

Standard foot: Salomon, Asics, New Balance.

Narrow foot: La Sportiva, Scarpa, some Scott models.

6. Waterproofing

Gore-Tex versions keep feet dry in moderate wet conditions, but vent moisture less effectively and dry slowly once soaked. For most trail races (except winter events), a non-waterproof version that dries quickly is preferable.

Choosing by distance

Short trails (under 30 km)

Prioritize lightness and responsiveness. Moderate cushioning is sufficient, and a 4-6 mm drop offers a good compromise. Target weight: 250-300 g.

Long trails and ultras (50 km+)

Cushioning and comfort become the priority. Choose a higher stack, reinforced protection and a slightly wider fit to anticipate foot swelling. Weight becomes secondary: 300-380 g is acceptable.

Technical and mountain trails

Stability, grip and protection come first. Opt for deep lugs, soft rubber compound, a solid rock plate and reinforced lateral support.

Common mistakes to avoid

1. Buying too small

In trail running, feet swell with distance and heat. Go half to a full size above your usual size. Try shoes at the end of the day when your feet are at their largest.

2. Neglecting the downhill test

When trying on shoes, walk on a downhill ramp. If your toes hit the front, the shoe is too small or poorly suited.

3. Choosing only by brand

Every foot is unique. The best shoe is the one that matches your foot shape, not the one worn by your favorite runner. Always try multiple brands.

4. Using one pair for everything

If you run regularly, rotate between 2-3 different pairs. This reduces injury risk (varied stresses), extends shoe lifespan and lets you match the shoe to the day's terrain.

When to replace your shoes?

The average lifespan of a trail shoe is 500 to 800 km, depending on terrain and your weight. Signs of wear: smooth lugs, "flat" cushioning, new joint pain. Track your mileage to anticipate replacement.

Find your shoes with RaceDayLab

Our Gear Finder helps you find gear suited to your practice. Complement it with the route tracer to analyze your next trail's profile and choose your shoes accordingly.