When it comes to rash guards, the details are what matter most. Therefore, XS Scuba added thumb loops to make it easier to get the rash guard sleeve through the wetsuit sleeve. XS Scuba's design attaches the collar with an external overlock stitch that won't chafe your neck and allows the collar to stretch comfortably over your head. True 4-way stretch provides comfort and flexibility for easier on/off and custom fit. Finally, they use an upgraded 8 oz. (227 g) heavy duty elastane blend with a SPF rating of 50 for maximum durability and protection. Prevent sun burn while snorkeling. The XS Scuba Midnight Harbor Long Sleeve Rash Guard is available in multiple sizes.