FABRIC AND FEATURES: Fabric: 60% recycled polyester/40% bamboo viscose interlock. Moisture wicking. Naturally anti-microbial. UPF 30+ sun protection. Hidden zip mock neck. Fabric Weight: 5.0 oz. Piece Weight: 0.51875. Feel good (and look good!) knowing that this item has a positive impact on our planet. All materials are certified sustainably made and prevent waste from ending up in oceans and landfills. You are upcycling 9 plastic bottles.