Aerodynamics 18 Vents Multi Sports Yellow Bike Head Gear Bicycle Helmet w/ Visor Adult Size M/L Condition: 	Brand New Sizes: Medium/Large; Circumference 58 - 66cm (23 - 26");Hat Size: 7  - 8 3/8 Color: Yellow Black Silver;Product Type: Helmet Sport: Cycling, Skating, Skateboarding and etc.;Item Weight: 230 grams (0.5 lbs) Item Dimensions: 	L 28 x W 21.5 x H 13 mm (L 11 x W 8 1/2 x H 5 1/10 Inches)