The soft, luxurious Icebreaker Men's Anatomica Short Sleeve Crewe is made from Icebreaker's lightest, finest Bodyfit150 fabric and is so thin and light that it layers perfectly under a long-sleeve top or sweater. Features: Weight: 150 Ultralight Fit: Slim Layer: Underwear Ultra lightweight, naturally odor-resistant, breathable Set-in sleeves; contrast stitching Crew neck Care: Machine wash. Dries fast in the shade, but do not tumble dry Fabric: 96% merino wool/4% LycraSee "Overview" below for sizing information.