Solid Wing Floppy/Bucket Summer Hat W/Snap Up Sides, Chin Strap & Mesh Air Holes 100% Cotton Crushable (Pack in your Pocket) & Lightweight 2 1/2" Brim XL: Best Fit From 22 1/2"-23 1/2" Head Circumference(Hat Size 7 - 7 1/2) L: Best Fit From 22"-23" Head Circumference(Hat Size 6 3/4 - 7 1/4) M: Best Fit From 21 1/2"-22 1/2" Head Circumference(Hat Size 6 1/2 - 7)