This comfy loose fitting baselayer is perfect for fast paced activities in colder temperatures. The Berghaus Women's Essential Long Sleeve Baselayer has a 100% polyester construction with a zipped neck that allows you to increase or decrease the amount of ventilation you receive.FeaturesZip neck - increase or decrease the amount of ventilation you receive.Protects against the sun - permanent UPF of 20+.Excellent moisture management - wicks away sweat thanks to a denier gradient structure.Flatlocked stitched seams - comfortable against the skin.Fabric: 100% polyesterWeight: 144g