KNOWLEDGE GAINED

Serious mountain travel requires an insulated piece with exceptional warmth-to-weight value. The Fission SL is our lightest, fully waterproof, insulated jacket that is outstanding in cold wet weather.

THE SKIN YOU'RE IN

GORE-TEX® full storm weather protection is teamed up with our exclusive laminated ThermaTek™ non-quilted insulation. The result is evenly distributed warmth that can stand up to anything. No cold spots.

NEVER TOO WARM

There are times when you're working hard but you can't or don't want to remove your insulation. Pit zips let you vent heat rapidly, extending usability on cold days. The insulated StormHood™ takes care of wind and storms with a fully secure, helmet compatible shelter.

FINISHING TOUCHES

Often this is the at base camp or sitting out a storm piece, so we've included two zippered hand pockets, two internal mesh dump pockets, WaterTight™ Vislon centre front zipper, and an invaluable hem drawcord that allows you to really bunker down and have what you need at the ready.

HELMET COMPATIBLE STORMHOOD™

The Arc'teryx helmet compatible Stormhood™ is designed to provide the ultimate protection in cold or wet weather. The laminated brim and hood adjusters secure tightly and deliver full coverage without restricting movement or visibility.

• Laminated brim
• Adjustable hood cinch cords
• Tall collar for full coverage

Arc'teryx Thermatek™ Insulation

Exclusive to Arc'teryx, Thermatek™ is a continuous filament, synthetic insulation that is treated with DWR (Durable Water Repellent) to make it hydrophobic, which means that it repels moisture very efficiently. The lofty insulation is then laminated to a backing fabric to ensure an even distribution and insulation.

• Arc'teryx's most efficient insulation when used in humid and wet conditions
• Very resilient and durable
• The fastest drying fill insulation in our collection