Assos ThermoBooster P1

The Assos ThermoBooster P1 is a versatile thermal layering piece engineered for riders who demand adaptable warmth, breathable performance, and packable convenience across changing conditions. Constructed with an advanced warp-knit thermal fabric, this lightweight layer delivers insulating comfort with exceptional stretch and an aerodynamic fit that conforms closely to the body without restricting movement.

Designed for year-round versatility, the ThermoBooster P1 can be worn as an outer jersey during cool conditions or layered beneath outerwear for additional core warmth in harsh weather. The highly breathable construction helps regulate temperature during high-intensity efforts, preventing overheating while maintaining thermal efficiency. Added pocket storage enhances functionality, giving riders convenient access to essentials without compromising fit or performance.

When conditions change, the ThermoBooster P1 packs down compactly to approximately the size of a rain jacket, making it easy to stow in a jersey pocket until needed again. Its adaptable design makes it an ideal companion across seasons—layer over lightweight pieces in spring and fall or integrate into a winter system for dependable cold-weather protection.

Key Features:

• Advanced Thermal Warp-Knit Fabric – Highly elastic construction delivers lightweight insulation with a close, aerodynamic fit
• Versatile Layering Performance – Functions as a standalone jersey in cool weather or as a midlayer for increased core warmth
• Packable Design – Compresses down for easy storage in a jersey pocket when conditions improve
• Integrated Storage Pockets – Added carrying capacity provides practical functionality for long rides and changing conditions