Heat Generating: the active technology that transforms motion into warmth! This bib tight incorporates Heat Generating technology, an innovative fiber that produces and stores warmth when stretched, activated by your pedaling movements. The result: you feel a constant warmth that effectively protects you from the cold down to a perceived -10degC* / 14degF. This bib tight features the new ULTIMATE Ekoi 8h chamois. Designed with a zero-friction anatomical shape, it offers perfect comfort for long rides. To ensure greater joint flexibility, a lightweight and ultra-breathable fabric panel has been strategically placed behind the knee. *0degC in open air