Built for cold belays, 3 a.m. starts and exposed bivies - planned and otherwise. Our soft and compressible Capilene® 3 Midweight Zip-Neck provides excellent insulation and next-to-skin comfort. The most versatile of our performance baselayers, it stretches, dries quickly and resists wear. The fabric is brushed on the inside for warmth and has a smooth knit face that glides easily between layers. Details include a low-bulk zip-neck for easy venting, thumb loops for secure hand coverage and offset shoulder seams to eliminate pack-strap chafe. Made of a 5.4-oz Polartec® Power Dry® 100% polyester double knit, with Polygiene® permanent odor control. Fabric is bluesign® approved.