Arc’teryx Proton Heavyweight Hoody M men’s insulated jacket Heritage Best

Created to offer the breathability, durability, and mobility guides and mountain professionals demand, Arc’teryx’s warmest Proton delivers air-permeable thermal performance for high-output missions in cold conditions. 100gsm Coreloft insulation and the Fortius Air 50 outer allow airflow that helps speed vapour transport and balance thermal comfort. 60gsm Coreloft in the sleeves and helmet-compatible StormHood reduces bulk, the regular fit layers easily, and articulated patterning removes restriction.