Amazon.com: Smallest Low Profile Cool Skull Pattern Half 。Akoury Boss 67 Unisex Matte Black Motorcycle Half Helmet / Skull Cap Condition: Pre-owned. Showing minor cosmetic surface scuffs/scratches on the matte finish from normal handling (as shown in photos), but structurally sound with intact straps, quick-release buckle, and clean interior padding. Specifications & Features: Style: Half Helmet / Skull Cap / Shorty Color: Matte Black Gender: Unisex (Suitable for both Men and Women) Size: Small (S) Head Measurement: 55cm – 56cm (per factory front sticker) Closure: Adjustable chin strap with a secure quick-release buckle for easy on/off. Design: Low-profile, classic minimalist look with front rivet detailing. Sizing Note: Please measure the circumference of your head (just above your eyebrows) to ensure a perfect fit, as powersports helmets rely strictly on centimeter measurements rather than standard clothing sizes.