Thermobooster Foil

Assos Thermobooster Foil While you may catch some pro riders still stuffing L'Équipe newspaper sheets (or fans' signs!) under their jersey before a long mountain descent, times have changed. The Assos Thermobooster Foil is an ultra-soft, windproof, and waterproof barrier that gives welcome protection against the elements without adding unnecessary bulk under a race jersey. And once you hit the welcoming warmth of the valley floor, it's easy to slip off and pack it into a jersey pocket, ready for the next downhill from altitude.