Lixada Bicycle Helmet Mtb/Road Bike Helmets Cycling Mountain Racing, Men Women Keep Safety, Adult Child Kids, with 21 Vents Adjustable Ultralight Integrally-molded Strap adjustment, easy to operate. 25 vents with inner air channels bring cool air in and flush warm air out, well-ventilated. Soft removable, washable, antibacterial pads for best wearing comfort. A quick-release buckle, simple to wear or remove it. Rotary internal regulator at the back adjusts the tightness as you wish.