Fit & Design: Stretch-adjustable for your size and comfort One size fits most for a comfortable look and feel Structured, no-stitch, bonded curved brim constructed for premium shade SunglassLock(TM) keeps your glasses in place Laser cut ventilation eyelets with reflective overlays Reflective details for visibility in low light Technology: bluesign(R) certified main body fabric and sweatband for water-repellence and moisture wicking 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: Pack flat, do not fold or crease brim Hand wash cold, line dry. Do not bleach, iron or dry clean Hat circumference: 22" - 24 1/2" Brim circumference: 2.75"