JOMA Men’s Sierra 2521 Grey Trail Running Shoe – FOAM REACTIVE Cushioning & Durable Grip

The improved JOMA Men’s Sierra 2521 Trail Running Shoe delivers high performance on technical and medium-difficulty terrain. Built for runners who want extra cushioning, protection and stability, the Sierra features a wider toe box for enhanced comfort on steep descents and long forest trail sessions.

Key Technologies

Durability – high-resistance rubber outsole for maximum lifespan
FOAM REACTIVE – advanced midsole cushioning for softer impact and responsive energy return
Protection – reinforced toe and side overlays for added safety on rocky terrain
SPORTECH – seamless thermosealed upper for a secure, lightweight fit
VTS – breathable mesh ventilation system for improved temperature control

Description

Designed for runners who tackle challenging woodland and technical trails, the JOMA Sierra 2521 combines cushioning, stability and comfort in a lightweight, breathable structure.

The upper is constructed from breathable Jacquard mesh, supported by JOMA’s VTS ventilation system to keep feet cool. A SPORTECH thermosealed support system enhances fit without adding weight.

Toe and side areas feature PROTECTION reinforcements to guard against roots, rocks and debris.

The midsole uses the new FOAM REACTIVE technology, delivering a plush yet stable ride. The forefoot incorporates firmer phylon for control on uneven ground.

The DURABILITY rubber outsole features aggressive grip patterns, ensuring traction, stability and dependable braking even on loose surfaces.

Technical Characteristics

Upper: VTS engineered breathable mesh with SPORTECH heat-sealed overlays
Midsole: Phylon with FOAM REACTIVE cushioning
Outsole: DURABILITY high-traction rubber
Drop: 7 mm
Water Resistance: None – designed for breathability
Intensity of use: Training
Recommended distance: 20–30 km
Terrain: Medium–technical trails
Runner pace: 4:00–5:30 min/km
Performance level: High

Performance Scale

Grip: High
Cushioning: High
Comfort: High
Durability: High
Stability: High
Responsiveness: Medium-High

Size Guide – JOMA Men’s Footwear

How to Measure

Heel to Toe: Stand on a sheet of paper and mark the longest point of your foot.
Measure both feet – choose the size based on the larger foot.
For trail running, we recommend 0.5–1 EU size up to allow for descents and swelling.

Approximate Size Conversion

EU	UK	US	Foot Length (cm)
40	6.5	7.5	25.4
41	7	8	26.0
42	8	9	26.7
43	9	10	27.3
44	9.5	10.5	28.0
45	10.5	11.5	28.6
46	11	12	29.3

Sizes vary slightly by model. Contact us if you need personalised sizing help.

Shipping & Click & Collect

Fast delivery across Ireland & Northern Ireland.
Click & Collect available at Borderland Muff Outdoor & More, Donegal.
Need help choosing the right shoe? We’re happy to advise.

Returns & Exchanges

Footwear can be returned or exchanged if unworn and in original packaging.
If unsure on sizing, we recommend trying at home on clean flooring.

Why Buy from Borderland Muff?

Independent Donegal store specialising in outdoor & trail footwear.
Authorised JOMA retailer with expert product knowledge.
Trusted by walkers, runners and trail enthusiasts across Inishowen and the Wild Atlantic Way.

Available now from Borderland Muff Outdoor & More – your local supplier of trail running and outdoor footwear in Donegal.

100% Irish

Est. 2000

Free Delivery Over €100 T&Cs Apply

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