Sedeta&reg; Cycling Bicycle Helmet Honeycomb Type 21 Holes Mountain Bike Racing Breezier Helmet Unisex Safety Protective Carbon with Visor Red Color Free Size Breather Durability Comfortable Cool You should choose a good breezier bicycle helmet for you. When you racing outside, climbing the mountain, this bicycle helmet is your first choice Look the exquisite workmanship, this cheap helmet get good durability This racing helmet is comfortable in any weather with a brim which looks special. Breather : 21. Color:Red. Size: Free Size. For head circumference 57 - 62 cm and 17cm and below under the head-width. 21 holes, normal adult body can take, head is too large or too small adjustable.