SLINX Snorkeling 5MM Neoprene Sun Protection Warm Diving Suit Top HPY005 Black Long Sleeve Outdoor Sport Skin Savor for Summer and Spring. Lycra material makes you comfortable even understand the water. Function:UPF 50+ perfect for the Snorkeling,drifting,Water scooter,Sailing,Water skiing etc. One perfect gift for the friends who are fond of water sport Please refer the size chart first.Asian Size.1 inch = 2.54cm