Proton Heavyweight Hoody Women's is a warm, durable insulated jacket designed for climbing and ski & snowboard activities, built as a warm, breathable layer for high-output missions in cold conditions. Product Type: Women’s warm, durable insulated jacket Material: Synthetic Fill 100gsm Coreloft™ insulation for warmth with air-permeable thermal performance Fortius™ Air 50 outer helps airflow and speeds vapour transport Helmet-compatible StormHood™ and articulated patterning to reduce bulk and improve mobility Pair it with a women’s shell jacket for added weather protection, and finish with a beanie for cold days. Created to offer the breathability, durability, and mobility guides and mountain professionals demand, our 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.