Leatt technical fleece in bio-sourced WarmYarn, ideal on its own or as a mid-layer in cool weather. 4-way stretch fit, helmet-proof hood, DWR without PFAS and UPF 50.

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

The LEATT ThermaFlow 2.0 MTB Jacket in lager yellow is the ultimate all-purpose thermal layer: worn alone on cool rides or as a breathable mid-layer under a shell, it adapts to all winter and mid-season conditions. Constructed from bio-sourced WarmYarn fabric made from coffee, it combines warmth, lightness, and environmental awareness in a stretchy cut designed for mountain biking.

Materials and construction

The bio-based WarmYarn, made from coffee, is the heart of this jacket: naturally odor-resistant, quick-drying, and biodegradable, it offers a responsible alternative to conventional synthetic fibers. The flat-knit outer surface ensures durability and slides easily under a shell, while the brushed interior creates an effective thermal buffer against the cold. Flat seams eliminate pressure points and ensure optimal comfort in all conditions. The fabrics are bluesign® certified, guaranteeing resource-efficient and environmentally responsible manufacturing.

Weather protection

The PFAS-free DWR C0 treatment gives the jacket a water-repellent and dirt-resistant finish to repel light rain and splashes without the use of harmful perfluorinated substances. The snug elastane cuffs act as a thermal seal to prevent cold air from riding up the sleeves. The helmet-integrated hood fits perfectly under your helmet and stays in place during descents. UPF 50 protection blocks 95% of UVA and 98% of UVB rays on sunny days at altitude.

Cut and fit

The Regular fit offers a balanced mountain bike silhouette, neither too close nor too loose, for complete freedom of movement in all positions. The fabric's 4-way stretch moves with you, from accelerating uphill to low positions on descents. The long sleeves are pre-shaped with anatomical cuts that maintain the perfect arm position with bent, without riding up or restricting movement during technical sections.

Finishes

Two zippered side pockets keep your essentials—phone, gel, keys—secure and safe during challenging terrain. The elastane cuffs provide both support and a snug seal with gloves, completing a cohesive and performance-oriented design.

Product information

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