Leatt technical mountain bike fleece in bio-sourced WarmYarn, 4-way fitted cut, under-helmet hood, PFAS-free DWR and UPF 50 to tackle cold rides.

LEATT ThermaFlow 2.0 MTB Jacket — Technical fleece for mountain biking in cold weather

The LEATT MTB ThermaFlow 2.0 Jacket in black is the essential mid-layer for riders who don't stop when temperatures drop. Worn on its own for cooler rides or layered under a shell in very cold weather, this technical fleece combines warmth, breathability, and environmental awareness thanks to its bluesign®-certified bio-based materials.

Materials and construction

Made from bio-sourced WarmYarn derived from coffee, the ThermaFlow 2.0 MTB Jacket combines a flat-knit outer surface with a brushed interior for immediate thermal comfort. This smart fabric ensures quick drying, natural odor control, and is biodegradable, making it a responsible choice without compromising performance. Flat seams reduce friction points for a long day in the saddle without irritation.

Weather protection

The DWR C0 treatment, free of PFAS and PFCs, gives the jacket a more environmentally friendly water-repellent and dirt-resistant finish. The UPF 50 sun protection rating blocks 95% of UVA and 98% of UVB rays for sunny outings at altitude. The snug elastane cuffs prevent cold air from getting in, ensuring optimal weatherproofing around the wrists.

Cut and fit

The regular fit and 4-way stretch fabric guarantee complete freedom of movement in any position on the bike. The pre-shaped long sleeves feature anatomical cuts that naturally follow your mountain biking posture, without excess fabric or uncomfortable tension. The helmet-compatible hood allows you to wear the jacket under your helmet without creating any uncomfortable bulk.

Finishes

Two zippered side pockets keep your essentials secure—phone, gels, keys—even in the most challenging sections. All materials are bluesign® certified, guaranteeing responsible manufacturing at every stage of production.

Product information

• Brand : Leatt
• Product Range : Mountain Bike Jerseys & Jackets
• Gender : Male - Unisex
• Sizes : S / M / L / XL / XXL