O'Neill  UV Sun Protection Mens 24-7 Tech Short Sleeve Crew Sun Shirt Rash Guard Elastane^Nylon Imported Elastane^Nylon, Made in USA or Imported Maximum Breathability, Protection from the Elements, In and Out of the Water 5oz. Polyester/Spandex Composite with Hyperdry 30+ U.P.F. (Ultraviolet Protection Factor) Loose Fit: Relaxed, fuller silhouette for complete comfort