Easily our customers' #1 pick. Wear this next to the skin or combine it with a Tahr Merino base layer when the temperature drops a bit. Constructed with Nylon and Merino wool, the European grid-fleece keeps the air layer around your body dry and at a comfortable temperature. We reinforced the shoulders to reduce abrasion when wearing your backpack. Designed to form to your body, but if you prefer a looser feel, just go up one size.