We kept our Matagorda Shirt clean and focused on what is most important, like a simple pocket configuration so you won't have to go hunting for your gear even when it's close at hand, a button-down collar to keep everything calm when the wind gets angry, roll-up sleeve tabs, and a vented rear yoke for air flow. Constructed of light and quick drying nylon-poly blend with engineered stretch, the Matagorda is the perfect companion for travel whether you are strapping on a backpack, running a boat or riding your beach cruiser. Studio model is 6' 170 lb wearing a size MSpecsButton-down collarHidden pocket with contrasting zipper pull under front right yokeMechanical stretch for better range of motionQuick drying 52% nylon, 48% polyesterRegular fitRoll-up sleeve tab at upper armSunglass cleaning microfiber at hemUPF 35 sun protectionVented back yoke