Leatt Jacket MTB ThermaFlow 4.0

Cold-weather coverage for high performance riding.

The ThermaFlow 4.0 Jacket offers sleek, cold-weather protection built for high-performance fall and winter riding. Strategically placed specialty fabric panels combine weather protection, insulation, breathability, and ergonomic stretch—delivering warmth up front with a wind-resistant, brushed fabric, and enhanced airflow out back with a breathable WarmYarn knit. The next-to-skin fit and elongated back are optimized for aggressive riding positions, while five rear pockets (3 top opening, 2 zippered) keep essentials secure. Treated with a PFAS-free water- and dirt-resistant finish and made with bluesign® approved materials, it’s streamlined, sustainable, and built to ride hard when the weather turns cold.

• FIT: Next to skin fit • Longer back length with gripper print • Pre-shaped ergonomic sleeves
• FABRIC: Strategically placed specialty fabric panels optimize weather protection, insulation, breathability, and ergonomics • Front panel and front sleeve fabric is wind resistant by weave construction with a brushed backside for insulation and 4-way stretch • Back panel and back sleeve fabric are made from a super elastic WarmYarn knit, giving very good insulation and heat management with natural antistatic and bacteriostatic properties • Quick drying • Hidden seams with overlocked stitching inside for comfort • Welded and seamless hemline
• SUSTAINABILITY: bluesign® APPROVED fabric (the gold standard for more sustainable textiles) • Plastic-free packaging
• WEATHER PROTECTION: Treated with DWR C0, PFAS(PFC)-free, for a more environmentally friendly dirt and water repellent finish • Low wind resistance
• VENTILATION: Strategically placed fabrics for optimal balance of weather protection and ventilation
• STORAGE: 5 back pockets (3 top opening, 2 zippered) • Pockets are made in a lightweight stretch polymer fiber weave for water resistance • Laser cut zippered chest pocket for phone
• OTHER FEATURES: Reflective print on lower back • Top quality zippers made by YKK • Durable YKK Vision front zipper with gripper print for easy handling • Antibacterial
• SIZES: XS-3XL (3XL only in black)