SanSoleil "SunGlow Fabric" Fitted, Sleeveless Zip Mock offers moisture-wicking, quick-dry, and cooling ventilation. And, most importantly, UPF 50 Protection. SanSoleil's Zip Mock Collar Stand adds extra protection for the back of the neck, while SanSoleil's UV 50 enhanced fabrics provide UV 50+ protection. (Normal fabrics offer much less protection from the sun.) SanSoleil's Sleeveless Tops are great for sports that require fabrics that move and are lightweight for exertion in the sun's heat.