Matte black children's skateboard helmet, stylish and comfortable fit. Brand: WALNUT SKATE Color: Matte Black Target Age: Little Kid Size: S size (48~53cm) Features: Adjustable straps [Reliable SG Mark Certification & Liability Insurance] This product has obtained the "SG Mark," which certifies that it meets the strict safety standards set by the Japan Product Safety Association. In the unlikely event of a personal injury due to a product defect, liability insurance of up to 100 million yen is included, allowing both children and adults to use it with peace of mind. Furthermore, it boasts high quality, conforming to EU and US safety standards (CE/CPSC, etc.). [Ultimate Fit & 360-Degree Adjustment System] The multi-point adjustment system (adjustment dial) located on the back of the head allows for millimeter-level size adjustments to fit the head circumference. It achieves a fit that wraps around the entire head, making it difficult to slip even during vigorous movements and providing a stress-free wearing experience. [Impact Dispersion Structure & Comfortable Ventilation] The exterior uses a durable hard shell, and the interior employs a high-density EPS (expanded polystyrene) impact-absorbing liner. It efficiently disperses and absorbs impacts, protecting the head. In addition, the excellent ventilation airflow system and skin-friendly soft-touch pads prevent heat build-up even during prolonged wear, maintaining comfort throughout the day. [All-Action Model for Multiple Purposes] With the concept of "Play HARD!", it supports a wide range of active sports scenes, including commuting to school by bicycle, as well as skateboarding, road biking, unicycling, and inline skating. The simple and stylish matte black design blends seamlessly with casual attire and suit styles. [Available in 3 Sizes for Children to Adults] To accommodate the whole family, three sizes are available: [S size: 48-53cm (approx. children 1-6 years old)], [M size: 52-57cm (approx. adults/women)], [L size: 55-60cm (approx. adults/men)]. *Head sizes vary from person to person, so please measure the circumference of your head at the forehead and the most prominent part of the back of your head with a measuring tape and choose the optimal size.