Xcel Men's 4-Way Stretch Short Sleeve Basic Rashguard Lightweight 8-ounce 4-way performance stretch fabric Rated UPF50+ for Excellent sun protection, blocking over 98% of UVA/UVB radiation Comfortable flatlock seams lie flat and smooth against your skin Loop It Or Lose It! waist loop ties can be secured to boardshorts for a more secure fit Stretch binding on arm and waist openings