Out of Black Diamond's massive collection of insulated jackets, the Men's First Light Stretch Hooded Jacket is by far the most breathable insulators. Fit for alpine climbs, backcountry tours, and moving fast in cold mountains, its Primaloft Silver Active insulation is performance-ready to keep warm when we're working up a sweat. Black Diamond designed the insulation in Schoeller softshell fabric for active-inspired stretch and water-resistance that sheds snowflakes and light moisture. The jacket's regular fit includes underarm gussets to ensure freedom of movement on the mountain, and there are adjustments at the hem and climbing helmet-compatible hood for a snug fit.