Made from renewable, natural beech pulp, modal is super soft and wears similarly to cotton, and is pleasantly soft against the skin without being sticky. The quick-drying polyester spandex fabric is highly breathable, absorbing and quickly releasing moisture to keep you dry at all times. With 40+UPF sun protection, the shirt provides the ultimate protection factor on hot days on the flats, river or boat. The slightly longer sleeves with thumb tabs cover the backs of the hands for additional sun protection. Sauna or no sauna, the Patagonia Tropic Comfort Shirt offers supreme comfort and protects you from dangerous sun rays so you can focus on your target fish. Details: Shirt made from renewable, natural beech fibre Polyester/Spandex functional shirt Breathable 40+ UPF sun protection factor Pleasant feeling on the skin Loose cut for maximum freedom of movement Sleeves with thumb tabs protect the back of the hands Relaxed fit Color: Steam Blue (STME)