In-mold helmets are currently the industry standard in terms . This construction method involves bonding a EPS foam liner to the inside of a lightweight polycarbonate shell, combining protection and materials that won't feel heavy. Because the outer shell is of a slim design and is fused directly to the liner, ventilation shafts and openings on the top of the helmet can be added. EP is a form of closed-cell foam which is surprising tough given its relatively light weight. In-mold helmets work well in various conditions and terrain, and they maintain high levels of protection while cutting back on weight.