Item Code: 9557-002291

The lightest, most breathable option in Arc'teryx Insulation Collection, the Proton SL Hoody takes the guesswork out of warming up on cold climbs and other high-output activities in cool conditions. The knit insulation holds its loft and shape no matter how often you stuff it into the bottom of your pack. More importantly, it allows your body to breathe, so you’re not left a sweaty mess after you have to step on the gas to get through the crux.

• Moisture-resistant outer face fabric
• Breathable
• Lightweight
• Durable 
• Octa® Loft breathable insulation provides thermal protection
• Fortius™ Air 20 face fabric effectively balances air permeability and weather resistance with lightweight durability 
• Fitted, with articulated patterning for mobility and comfort
• FC0 DWR (Durable Water Repellent) finish repels moisture and is PFAS-free
• Two zippered hand warmer pockets
• Single stretch woven zippered chest pocket 
• X000009557