PRO-TEC has been a standard helmet protector brand for action sports as well as skateboarding and BMX, as well as many other action sports. This classic skate is not an exaggeration that it is one of the most beloved helmets in the PRO-TEC lineup. The sleek hard shell exterior is made with a comfortable 2-Stage (2-layer sponge) that fits flexibly to various head shapes, and is lightweight and does not hinder movement even during aggressive action. Shell: High Density Polyethylene (HDPE) or ABS Plastic Liner: 2-STAGE (2-layer sponge) Ventilation: 11