BEAT THE HEAT WITH THE SIMMS SLACK TIDE FISHING SHIRT.Long trips under the sun can wear on you and wear you down. On those days, be sure to wear this Simms fishing shirt specially designed to dump heat and let you focus on what you do best. With its ability to ventilate and extendable collar, you can finally beat the heat.FEATURES UPF-50 2-way stretch main body with 4-way stretch panels Articulated sleeves for better range of motion 2 large chest pockets with mesh back for venting Machine wash and dryTECH SPECS Fabric: Main Body:78% polyester, 22% nylon; Side Panels: 91% polyester, 9% nylon