Choose the right gear for your climate: S1 for above freezing, S2 for below. Profila Softshell fabric powered by 37.5™ active particle technology. Profila Thermal on the back and underarms provides maximum warmth and breathability. Three open back pockets and two zip-up security pockets. Thermal cuffs seal in warmth. Reflective elements add contrast to enhance nighttime visibility. The fitted cut provides a streamlined body fit for enhanced performance. X.