Plus Size Big Men & Women Rash Guard Zippered Loose Fit Swim Shirt Big & Tall Zippered Rash Guard Shirt with short sleeves. Italian made Chlorine and Saltwater Resistant fabric. Highest sun protection rating of UPF50+. Relaxed, loose fit- retains color and shape. Sizes: 3XL= 48 inch chest; 4XL = 50 inch chest; 5XL = 52 inch chest; 6XL = 54 inch chest; 7XL = 56 inch chest. Measure under the arms, around the chest.