O'Neill  Men's Basic Skins UPF 50+ Long Sleeve Sun Shirt Elastane,Polyester Made in USA or Imported Skin Cancer Foundation Recommended Product; UPF 50+ Ultraviolet Protection Perfect For Surfing, Swimming, Paddle Sports, Boating, And Beach Days Comfortable yet durable construction. 6 ounce polyester or spandex four way stretch. Overlock stitched Minimal Seam Placement For Maximum Rash Protection Slim Fit: Fits Close to Body, But Is Not Tight