Arc’teryx Men’s Proton SL Hoody

The lightest, most breathable option in our 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.

What’s been updated: Updated with recycled Fortius™ fabric for improved durability, and chest pocket and design lines that align with the Proton Collection.

Features & Specs

Technical features

• Moisture-resistant outer face fabric
• Breathable
• Lightweight
• Durable

Construction

• Fortius™ Air 20 face fabric effectively balances air permeability and weather resistance with lightweight durability and stretch
• Octa® Loft breathable insulation provides thermal protection

Design & Fit

• Fitted, with articulated patterning for mobility and comfort
• Garment Centre Back Length: Size M is 29″/72cm – Varies by size

Fabric treatment

• FC0 DWR (Durable Water Repellent) finish repels moisture and is free from intentionally added PFAS

Hood configuration

• Helmet compatible
• Adjustable insulated hood

Pocket configuration

• Two zippered hand warmer pockets
• Single stretch woven zippered chest pocket

Sustainability

• Contains materials that meet the bluesign® criteria
• Body – bluesign® approved material
• PFAS (Per- and polyfluoroalkyl substances) Compliant

Size XS, S, M, L, XL, XXL

Weight 370g / 13.1 oz

Fit Fitted

Sizing chart

Men’s
Our size guide provides a general idea of how your body measurements correspond to our garments, however it does not fully reflect each item’s unique specifications. Each piece is designed with specific fits tailored to the intended activity, taking into account ergonomics, comfort, layering systems, and optimizing the performance of fabric technologies.

Jacket/shirt sizing chart – new sizing

Your body measurements in centimetres

Size	Sleeve	Chest	Waist	Hip
XXS	78	84	69	83
XS	81	89	74	88
S	83	94	79	93
M	86	102	86	100
L	89	109	94	108
XL	91	119	104	118
XXL	94	129	114	128
3XL	96	139	124	138

NOTE: Men’s fit has been updated with a revised fit. Medium size remains unchanged. Smaller sizes are now tighter and larger sizes are now looser. Arc’teryx sizes are intended to fit the above body measurements. If your measurements are between sizes, select a larger size for a looser fit or a smaller size for a tighter fit.

Activity Alpine/Rock

Model X000009557

Manufacturing facility Youngone (CEPZ) LTD, Bangladesh

Fit & Sizing

Fit: 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.

Materials & Care

Materials

• Lining: Polyester Octa Rachel knit Insulation, 98gsm – 100% Polyester
• Body: Fortius™ Air 20 – Plain Weave, FC0 DWR, 58gsm – 88% Nylon, 12% Elastane
• Origin of fabric: TAIWAN, CHINA
• Origin of dyeing: TAIWAN, CHINA
• Origin of Manufacture: BANGLADESH
• May release plastic microfibres into the environment when washing

Care

• Machine wash gentle low
• Tumble dry gentle low
• Do not bleach
• Wash dark colours separately
• Do not dry clean
• Do not iron
• Do not use fabric softener
• Double rinse