SwimZip Mens Rash Guard with Zipper Short Sleeve UPF 50+ UV sun protection blocks 98% of UVA and UVB rays. (UPF is the clothing equivalent of SPF). Easy all day sun protection. SwimZip's signature full length zipper for easy-on, easy-off. No more yanking tight, wet rash guards over your head! Comfortable, relaxed fit designed to make it easy to wear all day long. Thoughtful design features like a zipper garage, no-pinch zipper flap, and flat lock stitching. SwimZip has been featured to national television audience of over 6 million people (and five Sharks!) Check out all of our award winning sun protection products!