FNS1324 Features: * Thermal training shirt * Made of 96pct Polypropylene 4pct Spandex * Long-sleeve design covers the entire torso * Flexible fabric does not impede with stroke technique and does not put any added stress on the shoulders * Higher speeds are achieved when shirt is removed, helping re-create race-speed scenarios during training * Repetitive use will result in increased swim speeds and endurance levels * UVA and UVB ray protection * Youth X-Small (ages 4-6 or heights between 3"9"" - 4"6"") * Youth Small (ages 7-10 or heights between 4"6"" - 4"11"") * Youth Medium (ages 11-14 or heights between 4"11"" - 5"3"") * Youth Large (ages 13-14 or heights between 5"3"" - 5"7"") * Small (between 5"2"" - 5"6"" and 110 - 130 lbs) * Medium (between 5"4"" - 5"9"" and 120 - 150 lbs) * Large (between 5"8"" - 6" and 150 - 180 lbs) * X-Large (between 6" - 6"3"" and 180 - 200 lbs)