Alpinestars Sm3 Youth Solid Helmet Motorcycle Helmets The all-new SM3 Youth Helmet is anatomically engineered specifically for youth and junior riders. Optimized for MX, Enduro, and Off-road use, it incorporates advanced technologies from Alpinestars' adult range to deliver an ideal blend of performance, protection, and comfort. ✅Key Features Advanced Shell Construction: Features a lightweight, thermo-injected shell using a special polymer blend. Variable Thickness Engineering: The shell is designed with varying degrees of thickness to optimize the balance between impact protection and weight. Size-Specific Shells: Available in three dedicated youth sizes: Youth Small (YS), Youth Medium (YM), and Youth Large (YL). Ultra-Lightweight Performance: * ECE Version: 1060g. DOT Version: 1170g. Tailored Fitment: Crown and cheek pads are available in different thicknesses as spare parts to customize the fit. Growth Adaptation: YM and YL share the same EPS size, allowing a rider to upgrade an YM helmet to a YL size as they grow by simply changing the pads. Dedicated Small Fit: The Youth Small size features a smaller EPS specifically for very young riders (typically 3 to 4 years old). ✅Advanced Construction Multi-Density Inner Liner: Ensures the correct density in specific zones for superior impact absorption and reduced weight. Rotational Force Management: * A patented low-friction coating on the EPS liner acts as a slip plane. Mimics the brain's cerebrospinal fluid to reduce rotational acceleration forces from oblique impacts. Superior Climate Control: * Maximized ventilation via 10 intake ports and 7 exhaust ports. Aerodynamic visor designed to direct airflow into the intake ports. Safety Visor System: Patented visor release system releases with a pre-determined force to reduce neck strain during an impact. Sustainable Comfort: The comfort liner is constructed from recycled materials to reduce the environmental footprint. Integrated Hydration: Built-in channels for hydration tubes are integrated into the cheek pads. ✅Professional Protection & Standards Enhanced Chin Guard Protection: The structure and thickness of the chin area exceed standard homologation requirements for superior impact performance. Emergency Release System (ERS): Allows for the safe and easy removal of cheek pads while the helmet is still on the rider. Secure Retention: Features heavy-duty stainless steel D-rings for a secure and reliable fit. Global Certification: Fully conforms to both DOT certification and ECE 22.06 homologation for worldwide use. @import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700;800&display=swap'); :root { --primary-color: #009879; --secondary-color: #f0fdfa; --header-color: #0d9488; --key-column-color: #ffffff; } body { font-family: 'Inter', sans-serif; -webkit-font-smoothing: antialiased; color: #374151; } .main-title { font-size: 1.875rem; font-weight: 800; text-align: left; margin-bottom: 1.5rem; color: #111827; padding-left: 0.25rem; } .table-header-subtitle { font-weight: 700; text-transform: uppercase; font-size: 0.85rem; letter-spacing: 0.05em; color: #0d9488; margin-bottom: 0.75rem; display: flex; align-items: center; gap: 0.5rem; padding-left: 0.25rem; } .responsive-table-wrapper { position: relative; overflow-x: auto; border-radius: 12px; box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1); border: 1px solid #e5e7eb; background-color: white; -webkit-overflow-scrolling: touch; } .sizing-table { border-collapse: separate; border-spacing: 0; width: 100%; font-size: 0.875rem; } .sizing-table th, .sizing-table td { padding: 1rem 1.5rem; text-align: center; border-bottom: 1px solid #e5e7eb; white-space: nowrap; } .sizing-table thead th { background-color: var(--header-color); color: white; font-weight: 600; text-transform: uppercase; font-size: 0.75rem; border-bottom: 2px solid var(--primary-color); } /* Sticky first column */ .sizing-table th:first-child, .sizing-table td:first-child { position: sticky; left: 0; background-color: var(--key-column-color); font-weight: 800; z-index: 10; border-right: 2px solid #0d9488; text-align: left; min-width: 120px; } .sizing-table thead th:first-child { z-index: 20; background-color: var(--header-color); color: white; } .sizing-table tbody tr:hover td { background-color: var(--secondary-color); } .highlight-row { background-color: #f9fafb; } .unit-label { font-size: 0.65rem; opacity: 0.8; font-weight: 400; display: block; text-transform: lowercase; margin-top: 2px; } Youth Size Guide 📏 (Centimeters) Size Head Circumference (cm) Youth SM 48 - 49 Youth MD 50 - 51 Youth LG 52 - 53 (Inches) Size Head Circumference (in) Youth SM 18.9 - 19.3 Youth MD 19.7 - 20.1 Youth LG 20.5 - 20.9
