This matte black Lynx bicycle helmet in size S/M (54-58 cm), model All-Road, features an In-mold construction. This In-mold construction combines a polycarbonate outer shell with an EPS inner shell. This combination strengthens the helmet for good protection, but remains lightweight. The fit of the helmet is universal and easy to loosen or tighten with one hand via the knob on the back. The antibacterial pads on the inside of the helmet are washable and easily detached via Velcro bank. There are a total of 24 ventilation holes, which ensure good air flow through the helmet for maximum ventilation. The bicycle helmet is easy to open/close with the buckles on the adjustable chin strap. Features: In-mold construction: polycarbonate outer shell, EPS inner shell Size S/M: 54-58 cm Washable anti-bacterial pads 24 ventilation holes Specifications: Color: matte black Gender: unisex Material outer shell: polycarbonate Material inner shell: EPS Weight: 260 grams Ventilation holes, yes, 24 holes Head circumference: 54-58 cm Size: S/M