Insanely comfortable Mountain Hardwear Men's Butterman Crew is made from Mountain Hardwears exclusive fabric. In addition to its unbeatable softness, the fast drying fabric with Wick.Q is packed with outdoor performanceincluding great stretch and wicking. The Butterman Crew has an active fit and UPF 50 for maximum sun protection. 170gm2 sanded stretch jersey fabricationis 85% polyester15% elastane. Wick.Q moisture wicking keeps you cool and dry. Fast drying fabric. UPF 50 sun protection. Active fit is a trim fit, just loose enough for layering and freedom of movement. Center back length: 28 71 cm. Avg. wt. 6 oz. 170 g.