The Simms TriComp Cool Long Sleeve Shirt breathes easy, dumps moisture, and dries quickly. Additional features include UPF50 sun-shield and the A/C-like feel of Coolcore fabric. Anglers will also appreciate chest pockets that deliver fly-box storage, a big open casting back, strechy sleeves, and the sunglasses cleaning heroics of a fulltime chamois conveniently located inside the shirt’s hem.Coolcore products provide chemical-free cooling. Chemical-free cooling provides up to 30% lower surface temperature when wet (by sweat or water).