Strauss Cycling Helmet (Black/White) Material: Other In-box Contents: 1 Material - pvc, PC & EPS foam Adjustable - this adult cycling helmet comes with a standard size, equipped with the easy-use dial system and side straps makes this nutcase helmet adjustable to different head sizes Lightweight - this biking helmet is made of lightweight material; the inner pad uses breathable material for a comfort wear Ventilation - honeycomb type 18 vents. The adoption of specialized aerodynamic and ventilation design allows air to go through the biking helmet