PlayaPup Dog Sun Protective Visor Hat, UPF 50+ Sun protective dog visor hat with hook and loop velcro closure to keep hat on, the perfect sun accessory to help cover their eyes while on their daily walk Made from UPF 50+ sun protective fabrics that help block 98% of UVA and UVB rays. Fabrics are free of sunscreen chemicals, great for sensitive pooches! Hat bill is wide and flexible yet sturdy to protect your dog's eyes, adjustable hook and loop velcro closure SUN PROTECTION: Made from UPF 50+ sun protective fabrics to block 98% of UVA and UVB rays. Fabrics are free of sunscreen chemicals, great for sensitive pooches! SIZING: Measure from across forehead and run measuring tape under dog's ears to around the back of the head. XX-Small: 10-12.5". X-Small: 12.5-14.5". Small: 14.5-16.5". Medium: 16.5-20.5". Large: 20.5-24.5". X-Large: 24.5-27.5". SEE OUR SIZE CHART UNDER PRODUCT IMAGES, LAST PICTURE. All measurements in inches.