Compressport ON/OFF BASE LAYER LS TOP W The Compressport ON/OFF BASE LAYER LS TOP W has thermoregulation based on body-mapping that is targeted to the muscles. Designed for optimal performance in cold conditions. In winter, choosing the right base layer can be the most important thing you can do to stay out longer and not cut your workout short. The On/Off base layer is ideal for all outdoor sports. On/Off technology, which literally breathes with you, regulates ventilation and protection depending on the intensity of your movement during workouts. Compressport ON\/OFF BASE LAYER LS TOP W