Made for performance and great for layering, the Free Fly Men's Flex Quarter Zip Shirt is a great choice for the trail, the gym, or barbecues in the backyard. Made primarily of viscose derived from bamboo, this item features Free Fly's bestselling Flex fabric. It's made to move with you, and to give you all the freedom of movement you desire from a quality performance shirt. Raglan sleeves offer an appealing shape, and the collar features a super soft lining. This shirt provides UPF 50 sun protection, which you'll appreciate on cloudy and sunny days alike.