What Our Gearhead(R) Experts Are Saying:"I wore these on a multi week expedition where every camp brought a new level of cold, and the modular liner system meant I could adjust warmth without swapping gear. The Kevlar reinforced seams held up through weeks of constant use with ropes and gear."An 8,000 meter peak doesn't care how prepared you think you are, it just keeps getting colder. The Alti GORE-TEX Mitten has become the standard for climbers who spend weeks at altitude, where hands have to function through storms, wind, and nights that never seem to end. Wear the modular system on a long expedition, and the removable Primaloft liner lets you adjust warmth as you move from base camp to a summit push. The waterproof, windproof GORE-TEX shell stands between your hands and the worst the mountain has to offer, and the Pittards Armortan leather palm holds up to the constant abrasion of ropes, ice axes, and rock. Kevlar stitching reinforces every seam against weeks of hard use, while the cinchable gauntlet and elasticized wrist keep snow and wind from finding their way in. A glove clip and carabiner loop keep the mitts secured to your harness, so they're always within reach when the temperature drops without warning.