Navy rash guard, size M, comfortable to wear with a material of 80% nylon and 20% polyurethane. - Color: Navy - Size: M - Material: 80% nylon, 20% polyurethane Thank you for viewing. Although the size is listed as M, it appears smaller than a regular M size because it's for school use. It has been worn about 3 times. Please understand this before purchasing. Please comment before purchasing to check stock availability.