Free Fly Bamboo Lightweight Long Sleeve Tee Size: Men’s Medium. See photos for more details. Color: Tropic Orange Features: 70% Viscous from Bamboo, 30% Polyester Fiber. UPF 20 Very comfortable shirt from an awesome brand. Check out my other always quality outdoor and athleisure apparel for sale. I strive for detailed and transparent listings. Don’t risk disappointment. Buy with confidence.