Reflective. the Edges & Both Side Are Reflective. Theres a Reflective Sandwich Trim That Enhances Visibility During Those Early Morning & Late Afternoon Running Workouts. the Best Cap for Night Running Material. Polyester & Cotton - by Applying Super Light & Moisture Wicking Fabric & Massive Mesh Design, Brings You a Lot of Cool & Comfortable,(inside Wrist Sweat Band is Very Soft & Cozy). the Hat Can Dry Out Very Fast After Washing. Hat Circumference. 21.6-23.6 Inches (55-60cm), Hat Brim. 4inches, Flexible Strap with Snap-in Buckle Closure Offers a Custom Fit.