Assos - ThermoBooster Bib Tights S11 - Men's - Black Series - 2026

Assos - ThermoBooster Bib Tights S11 - Men's - Black Series

The ThermoBooster S11 is the most versatile winter bib tight in the Assos line-up is engineeered for layering, cross-training or extreme-condition insulation. Designed without an integrated insert, it adapts seamless to your needs.

Whether you need to layer over summer-weight bib shorts for winter riding, adding a bit more warmth over spring bib tights or to use alone for cross-training. With low-volume insulation, raw-cut finishing and reflective details make the ThermoBooster a true year-round training essential.

Key Features

Featured Fabrics

• RX EVO Plus, the warmest fabric in the RX EVO family. Providing odor resistance, abrasion resistance and soft, brushed insulation with asymmetrical stretch to wrap major muscle groups. Maintaining that Assos deep black colour, even when stretched. 

Construction & Fit

• A streamlined and body-contoured regularFit that eliminates excess bulk for layering flexibility.
• Raw-cut waist & ankles that reduces volume, creating a smooth, compressive finish that layers easily under or over other kit.

Engineering

• A zeroPressure Waist that is highly elastic yet still secure and prioritises comfort without pinching. 
• An X-Frame suspension that stabilises the lower back and bib structure during movement. 
• Reflective panels in the shape of large leg stripes that increase visibility in low-light conditoons, flashing dynamically with every pedal stroke. 

Best For

• Winter cycling when layering over shorts
• Extreme cold-weather setups as a thermal mid-layer
• Cross-training activities like winter running.
• Riders seeking maximum layering versatility in one piece of kit. 

About ASSOS:

ASSOS of Switzerland’s mission is to provide innovative, technically outstanding cycling apparel with meticulous, lean design.

Since creating the first ever Lycra® cycling shorts in 1976, the company has developed a number of innovations that have pointed the way for the evolution of cycling wear – most of its innovations are now industry standards. Today, ASSOS proudly provides its Total Cycling Comfort to riders in more than 30 countries.

MyTriathlon is proud to have been chosen to stock the prestigious ASSOS range of clothing and accessories. If you have any sizing or specific product queries, call us on 0207 183 4116, or get in touch via WebChat.