"The Tidal 1/4-Zip T-Shirt is a quarter-zip pullover made from 100% recycled polyester, and its Omni-Shade fabric holds a UPF 50 rating by blocking UVA and UVB rays. The fleece-weight fabric adds light warmth, so the pullover works as a single layer on chilly mornings spent fishing. What Our Gearhead® Experts Are Saying:""On the dock at first light, my hands go cold first, and the thumbhole cuffs hold the sleeves over the backs of them. By midmorning I open the quarter-zip to let air in at the neck. This is a cool-start layer, so on a cold, windy day I add a jacket."""