DURABLE - Built for both comfort and impact resistance with REINFORCED ABS SHELL & THICKENED SHOCK-ABSORBING EPS CORE. EXTRA REMOVABLE LINING - Skateboard helmet with two removable liner for different head sizes and easy to wash the sweat away. A HELMET for MULTI-SPORT - Smooth Venlitation System helps to protect and enjoy SKATING, CYCLING, BMX, MTB and etc.