Lightweight button up fishing style shirt with Solar-Factor UPF 40+ UV Protection and added spandex for increased range of motion. Fit & Design: Relaxed fit for extra comfort and mobility, if you think you are between sizes best to buy the smaller size Soft and Comfortable Polyester Spandex Adjustable Back Venting and Underarm Mesh Venting Bellow Chest Pockets with Drain Holes and Gear Loop Sunglass Holder and Cleaner Rod Holder Solar-Factor UPF 40+ UV Protection Additional Details: Machine wash cold with like colors, close hook and loop tape before washing, only non-chlorine bleach when needed, tumble dry low, remove promptly, cool iron if needed