evo.com | Arc'teryx Synthetic > The Arc'teryx Proton SL Hoodie takes the temperature guesswork out of cold-weather activities with its ultra-light, breathable knit insulation that lets your body regulate naturally even during high-output sequences. The loft maintains its shape no matter how often you stuff it into your pack, giving you reliable warmth that breathes with you instead of turning you into a sweaty mess when the route demands everything you've got. Articulated Patterning for Unrestricted Mobility FC0-DWR Finish Repels moisture and is PFAS-free. Body Fortius(TM) Air 20 | 88% Nylon, 12% Elastane Two Zippered Hand Pockets Fitted A trimmer fit is patterned to stay close to the body through the chest, waist, hip, and thigh. Its low profile eliminates bulk, moves with the body, and fits comfortably over first layers or under outer layers. | Arc'teryx Proton SL Hoodie Men's 2026 - Small Blue | Nylon/Elastane