Sweet Protection Strutter Helmet The Sweet Protection Strutter offers substantial low-volume protection for river running, rock gardening, surfing and playboating. Resembling a baseball batting helmet, the computerized 3D shape provides great style and comfort and offers impressive protection performance for its low volume. Features Carbon fiber reinforced polymer shell Ethylene vinyl acetate (EVA) shock-absorbing liner Low volume protection Occigrip dial head adjustment lock Lightweight Optimized for paddling Includes comfort pads for customized fit Warranty: 2 years on manufacturer defects How to measure your size: Wrap a measuring tape around the head, just above the ears. Try to keep it level front to back. Use the chart below as a guide. All Sweet Protection helmets have adjustment systems and are delivered with fit pads to ensure the perfect fit. Sizing Size S/M M/L L/XL Centimeters 53 - 56 cm 56 - 59 cm 59 - 61 cm Inches 20.85 - 22" 22 - 23.20" 23.20 - 24"