Lazer Tonic Bike Helmet The Tonic helmet offers protection, style, and comfort for riders just getting into cycling. The helmet's low-profile design makes it feel at home wherever you take it. An in-mold construction keeps the weight down, while 28 vents ensure you're always cool and comfortable while riding. A dial at the back of the helmet lets you adjust a head basket that securely holds a large portion of the back of your head. A quick turn of the TS+ dial ensures a snug and comfortable fit that keeps the helmet securely in place. Adjust it in an instant and start your cycling adventures. Specifications: Color: Matte black Gender: Unisex Outer material: Plastic Lining material: EPS Adjustment: dial Head circumference: 58-61 cm Dimensions: 23.9 x 33.8 x 18.2 cm (LxWxH) Vents: 28 Led: Compatible TS + led