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 in back & underarms provides maximum warmth & breathability Three open back pockets & two zippered security pockets Thermal cuffs seal in warmth Reflective elements add contrast to enhance nighttime visibility Fitted cut provides streamlined body fit for enhanced performance