The Smith MAINLINE MIPS is an ultra lightweight and super safe integral helmet. Safety and low weight is provided by the Koroyd construction that absorbs 48% more energy upon impact in comparison with a classic foam construction. It is also supplemented by the MIPS liner system. The helmet is perfectly ventilated thanks to the Aerocore Koroyd construction, AirEvac system, and 21 air vents. Three sizes of face pads available, two sizes of of nape pads, and two inner antibacterial and hypo-allergenic pads are included in the package. That helps you fine tune your sizing.