Arc'teryx Proton SL Hoody M men's insulated jacket

The Proton SL Hoody from Arc'teryx is a men's insulating jacket designed to be the lightest and most breathable option in the collection, ideal for maintaining the right warmth during low-temperature climbs and high-intensity activities in cool conditions. Featuring the innovative Octa Loft mesh insulation, this piece retains its loft and original shape even after being repeatedly compressed at the bottom of a backpack, ensuring excellent thermal management that allows the body to breathe and prevents sweat buildup during the most strenuous key passages. The outer Fortius Air 20 fabric, now updated with recycled material for greater durability, perfectly balances air permeability with weather resistance, while also offering remarkable elasticity and lightness. The technical construction includes a PFAS-free FC0 DWR water-repellent treatment that repels surface moisture, protecting the integrity of the insulation. Designed with a fitted cut and articulated patterning for maximum mobility, the jacket features an adjustable insulated hood compatible with a helmet, two zippered handwarmer pockets, and an elastic fabric chest pocket. Weighing only 370 grams and made with bluesign certified materials, this model represents the perfect balance between thermal protection and breathability for mountaineering and rock climbing.