Known internally at ASSOS HQ as the Thermobooster, this packable long-sleeve mid layer does just that—amplifying core insulation to keep you riding in total, protected comfort during very cold winter conditions.
ASSOS designed the Thermobooster to mirror that of a long-sleeve jersey—complete with a full-length zipper and front stash pocket that doubles as a storage pouch—creating a versatile mid layer that boosts thermal insulation around your core and arms, yet disappears in a rear pocket if need be. In fact, there is a dedicated Thermobooster storage sleeve into the ASSOS johDah Winter Jacket for this exact reason, allowing you to enter your winter training missions fully prepared for fluctuating weather and drastic changes in elevation.
Layered directly above your ASSOS Skin Layer, the Thermobooster traps body heat, breathes and expels excess moisture using our OSMOS Heavy textile. This is the thickest of ASSOS brushed-back fabrics, featuring a stretchy warp-knit composition that smoothly wraps your torso and arms for a full-on fortress against the cold. The raw-cut hem and reversed zipper smoothly integrate with layers above and below, ensuring your complete outfit system remains as streamlined as possible. ASSOS CLIMACODE 3.3 WINTER - color code blue
Color: blackSeries Sizes: XS, S, M, L, XL, XLG
TECHNOLOGY OSMOS Heavy: This warp-knit is the main textile and the heaviest in our brushed OSMOS family (290g/m2), featuring asymmetrical stretch and a soft, durable construction. High levels of insulation are derived from the brushed skin-facing side. Ramp Pocket: A single textile-lidded pocket doubles as a storage pouch. Reversed Zipper: Full-length zipper, reversed for a smooth action and clean integration with outer layers. Taped Neck: Frictionless comfort next to the skin, aided by a microfiber zipper garage. Raw Cut: Hem is raw cut, creating a smooth, aerodynamic design that seamlessly pairs with additional layers. raceFit: A second-skin fit that’s tighter and more compressive than our regularFit, engineered for high-output, drag-free riding and racing. Composition: 55%PA 27%PL 16%EA 2%PP