Our ponytail hat takes technical UPF 50+ innovation to the next level. From its sliding side panels and anti-glare underbrim to the hidden pocket and multiple ponytail openings, this adjustable hat brims with sun-smart features for extra UV coverage and convenience. COOLIBAR SUN PROTECTION: Leading Sun Protection Company worldwide, guarantees UPF 50+ apparel blocking 98% of UVA and UVB rays. DERMATOLOGIST ENDORSED: First company honored with the Skin Cancer Foundation Seal of Recommendation and trusted by top dermatologists FEATURES: Sliding panels in brim for adjustable sun coverage, hidden zippered pocket on left side for small essentials, anti-glare under brim to reduce glare reflecting off surrounding surfaces and two hidden openings for high or medium ponytail, Internal sweatband, elastic in center back for comfortable fit, 4 3/4 inch brim, Approx. circumference: 22 1/2 inches (S/M) 23 1/2 inches (L/XL) 25 inches (XXL), Spot Clean, Imported RECOMMENDED FOR: when you want to keep your cool and stay UPF 50+ sun protected while picking up the pace outdoors - includes fitness, basketball, jogging, golf, power walking, cycling and other outdoor sports activities NOT RECOMMENDED FOR: swimming, not chlorine and salt water resistant or water repellent