The front and upper back panels are made up of our 3L wind- and waterproof SPHERE Light textile, with a second layer of fleecy OSMOS Light as the lining. The lower back panel is made using our OSMOS Heavy, the most insulating of our brushed-back materials, while the sleeves lean on a warp-knit 3L ZigZaggy Foam that wraps you in plush, wind-blocking insulation.

On the front and upper back panels, our double-layer twinDeck fabric construction locks out the cold and creates a pocket of insulating air between the layers, while still remaining exceptionally breathable. To ensure you don’t overheat, we added our Diffusor “valves” at the shoulders, which act like a set of air vents that draw in air from the outside and inject it between the jacket’s layers of fabric. As a race-ready garment, it’s stripped to its essence with an aerodynamic raceFit that seamlessly integrates with other layers.

Diffusor: An ASSOS-exclusive sewing construction that creates dual “valves” on the fronts of the shoulders, drawing in cool air for added ventilation.