Arc'teryx Men's Phase Sl Boxer Short Phasic SL 100% Polyester Hang Dry PHASE SL BOXER SHORT - Technically advanced, designed for high-output activities and comfortable enough for daily wear, the mens Phase SL boxer is a silkweight performance baselayer that rapidly wicks moisture and stretches with the body. NEXT GENERATION - Phasic SL polyester yarns speed dry times, improve moisture transfer and elevate comfort. The gusseted crotch facilitates ergonomic freedom, and flatlock seam construction minimizes potential irritation. Updated style lines and improved fit. SUPERLIGHT - Superlight materials and design, emphasizing light weight and packability over durablity. ARC'TERYX ESSENTIALS - Versatile high performance designs for diverse activities and conditions. Durable and light. PHASE - Quick dry base layer with excellent moisture management. For high output activities.