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The Arc'teryx Proton SL Hoodie 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.
Fortius™ Air 20 – 88% Nylon / 12% Elastane
FC0 DWR
Octa® Loft
100% Polyester
Fitted – Our 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.
Articulated Patterning
Two Zippered Handwarmer Pockets
Single Stretch Woven Zippered Chest Pocket
Helmet Compatible, Adjustable Hood
| Warmth | Description | Ideal Conditions |
| Shell | Outer shell with no insulation. Pair with base layers and mid layers to fine tune the level of warmth required. | Variable |
| Warm | Light insulation. Use additional base or mid layers to add warmth when temperatures drop. | 20° - 35° |
| Warmer | Moderate insulation. Suitable for cold conditions. | 10° - 25° |
| Warmest | Heavy insulation. Designed to keep you comfortable and protected on the coldest days. | Below 15° |
| Size | XXS | XS | S | M | L | XL |
| Weight (g) | 311 |