Giro Aries Spherical MIPS Helmet Medium Matte SharkskinThe Giro Aries Spherical MIPS Helmet is a high performance road helmet with a Polycarbonate shell with EPS liner and boasting 24 vents with deep internal channeling to keep you cool. This super lightweight helmet brings together Spherical MIPS Technology, the Roc Loc 5 Air, and Ionic+ padding for safety, simple adjustments, and long lasting comfort. Sizing-Small: 51-55cm, Medium: 55-59cm, and Large: 59-63cm. Available in Matte Black, Matte White, Matte Anodized Blue, Matte Anodized Harbor Blue Fade, Matte Carbon/Red, and Matte Metallic Coal/Space Green.196178177405