Bell Event Road Sport Bicycle Helmet. With its inviting style and comfort driven technologies, the Bell Event Sport road Bicycle Helmet is pure motivation to ride more miles. Its In Mold Polycarbonate Shell delivers superb impact protection while keeping the weight low. There's a massive amount of ventilation courtesy of 22 channeled openings plus a quartet of brow ports to keep the air flowing strong for superb cooling comfort. And speaking of comfort, the Twin Axis Gear retention system ensures the Bicycle Helmet is perfectly positioned on your head with its dual axis adjustment.