The Arc'teryx Men's Sigma FL Pant is a lightweight pair of softshells suitable for summer mountaineering and alpine climbing. Its Fortius 1. 0 fabric is the lightest softshell from Arc'teryx, and it boasts a four-way stretch, exceptional breathability, and reliable water-resistance for ideal protection in the alpine during warmer seasons. Arc'teryx designed it with a trim, articulated fit that ensures full mobility on the mountain despite its slimmer look.