Large XL 64cm Size Bicycle Helmet Men's Breathable MTB Sports Safety Bike Helmet Oversized Head Circumference Cycling Helmet Specification: 1: Brand: COLNELS 2: Model: COLNELS-338 3 :Size XL (60-64) CM 4 :Air vents  19 5 : Suitable for road bikes, unisex 6: Inner pad: washable comfort pad, chin pad. 7: Material: PC, Inner: EPS, Foam+Nylon Adjustment Band Outer: Safer and more perfect. 8: Adjustment system: 360-degree adjustable size, easy to rotate with one hand.