Built for the coldest belays and the most unforgiving winter objectives, the Taiss Pro Belay IN Hooded Jacket is Mammut’s answer to true expedition-level insulation. Designed to pull on over your hardshell, it delivers massive thermal output without bulk, using a strategic blend of DRY DOWN and high-loft synthetic fill in high-wear zones. The result is a fortress of warmth engineered for vertical terrain, icy ledges, and long nights spent waiting for the next window of weather.

A Pertex® Quantum Pro 10D shell—reinforced with Pertex® Diamond Fuse technology—gives this jacket the rare combo of ultra-light feel and impressive abrasion resistance. Box-wall baffles eliminate cold spots entirely, letting the 850-fill hydrophobic down fully loft no matter how harsh the conditions become. Everything is built for real winter use: oversized VISLON® zippers that operate cleanly with gloves, a climbing-helmet-friendly hood, harness-access options, and a built-in neck-gaiter tunnel that traps every last degree of heat.

From the synthetic reinforcement at the forearms to the high-mounted hem adjustment and stretch cuffs, every detail reflects cold-season practicality. When temperatures plunge and the mountain turns hostile, this is the belay jacket you want clipped to your harness.

FEATURES

• Ultra-light 10D Pertex® Quantum Pro shell with PFC-free DWR for weatherproof performance

• Pertex® Diamond Fuse reinforcement for exceptional durability and water resistance

• 850-fill DRY DOWN with hydrophobic treatment for long-lasting loft in wet conditions

• High-loft synthetic insulation at forearms, shoulders, and collar for added durability and warmth

• Box-wall construction to prevent cold spots and maximize insulation efficiency

• Climbing-helmet-compatible hood with single-point adjustment

• 2-way #5 YKK® VISLON® center zipper designed for glove-friendly use

• Snap-back storm flap for half-zip harness access

• Two harness-compatible hand pockets + one external chest pocket (all VISLON® zips)

• Two large internal Powermesh pockets for gloves, skins, or hydration

• Integrated internal neck-gaiter tunnel to seal in warmth

• Stretch wrist cuffs with cozy fleece interior

• High-mounted hem drawcord tunnels to avoid harness interference

• Packs into the included stuff sack

• Responsible down sourcing and PFC-free treatment

SPECIFICATIONS

• Fit: Relaxed

• Weight: 578 g

• Shell Fabric: 100% Polyamide (recycled), 10D x 10D

• Insulation:

  • Down: 90% white goose down / 10% feather, 850 cuin (200 g)

  • Synthetic: 120 g/m² at forearms + shoulders

• Lining: 100% Polyamide (recycled) + stretch panels

• Best For: Winter climbing, alpine missions, ski mountaineering

• Notable Tech: Pertex® Quantum Pro, Pertex® Diamond Fuse, Nikwax DRY DOWN