tasc performance men's coastal upf 50+ outdoor adventure travel short sleeve tee shirt Body: 55% Cotton, 40% Viscose From Bamboo, 5% Elastane; Sleeves: 50% Cotton, 42% Viscose From Bamboo, 8% Elastane Imported Natural temperature regulation Natural anti-odor technology for extended wear Moisture wicking UPF 50+ sun protection 4-way stretch fabric Natural temperature regulation