Description: Comprehensive Protection: This sports ski helmet offers full protection with a switchable ventilation system. When open, it accelerates the intake of fresh air, and when closed, it locks in warmth for a comfortable and lightweight experienceQuality Material: The snow ski helmet is made of integrated PC anti collision hard shell material, paired with an PP cushioning layer for efficient shock absorption and impact resistanceAdjustable Fit: Equipped with a 3D stereo head circumference adjuster, the skateboard helmet can be adjusted to fit different head sizes perfectly, ensuring better adherence to the headDetachable Lining: 12 ventilation holes sports helmet with comfort chin pad is designed with detachable soft and warm lining and earmuffs, quick release buckled, comfortable to wearWide ApplicationsThis winter snow ski helmet is widely suitable for outdoor sports skiing, skateboarding, roller skating, etc. Also a great gift choice for families and friends who love outdoor sports Specification: Material: PCPP Size Chart: S: Head Circumference 51 cm-54 cm/20.08 inch-21.26 inch Package Includes: 1Ski Helmet Note: Please allow slightly errors due to manual measurement.