Fit & Design: Adjustable chinstrap drawstring for your size and comfort bluesign(R) certified main body fabric and sweatband for water-repellence and moisture wicking Mesh fabric included for breathability One size fits most for a comfortable look and feel No-stitch, bonded flat brim construction for easy packability Laser cut ventilation eyelets with reflective overlays Reflective details for visibility Technology: Moisture-wicking sweatband/underbrim for comfort and to keep sweat away from your skin UPF 50+ sun protection to keep your skin from harmful UV rays PFA-free durable water repellent finish to keep the elements away Additional Details: Crushable design is travel friendly and retains shape Hand wash cold, line dry. Do not bleach, iron or dry clean Weight: 2 oz. Hat circumference: Medium: 22" - 22 7/8"; Large: 22 7/8" - 23 7/8" Brim circumference: 2"