Assos Endurance ThermoBooster long-sleeved base layer

The Endurance ThermoBooster is a mid-layer designed to adapt to all seasons. Thanks to its medium-weight insulation, it layers easily over your existing garments to create the thermal regulation you need.

In summer, it provides extra warmth during alpine descents. In wet weather, it maintains your body’s microclimate when worn under a waterproof layer. In winter, it pairs with a warm jacket to boost insulation and maintain temperature regulation perfectly suited to extreme conditions.

This simplified design offers universal practicality: one fabric, one zip and total freedom in your layering choices.

Technical specifications:

- Colour: BlackSeries
- Sizes: XXS to XXXL
- RX: Roubaix-style thermal fabric, ultra-versatile. Offers soft, medium-weight insulation with a lightweight, stretchy structure that makes layering easy.
- regularFit: a streamlined cut that follows the body’s contours without restriction, reducing seams and eliminating chafing.
- Raw Cut: race-inspired raw edges for reduced bulk, a clean look and crease-free layering.

Assos Size Guide