Arc'teryx’s Proton Crew Neck Pullover Sweat - your new favourite go-to for any mountain escapade. This versatile piece works on its own or as a midlayer and is light but warm, breathable, and moves with you. The Octa® Loft insulation keeps you cosy, while the Fortius™ Air 50 outer fabric is durable, water repellent and stretchy. Plus, it shakes off moisture like a champ. Perfect for hikes, climbs, or just hanging at the crags.