The award-winning Obex SPIN is the perfect support for long and short days on the mountain. Developed with POC’s whole helmet approach, using advanced design and materials optimized for weight and crash protection, the Obex SPIN features an EPS liner, PC Shell and ABS top shell. Patent pending silicone pad technology system, SPIN (Shearing Pad Inside) complements POC’s whole helmet approach to deliver superior levels of comfort, fit and performance. Precise and fully adjustable ventilation can be adjusted to meet individual needs and weather conditions. Sliding vent covers allow the user to open or close helmet ventilation based on their own comfort whilst integrated vents at the front of the helmet allow air to flow through goggles, preventing fogging and keeping clear vision. An interior size-adjustment system allows a user to find an ideal fit without needing to change pads and the design has been optimized for a seamless fit and compatibility with POC goggles. Technical Features Lightweight in-mold construction with EPS liner Robust ABS top shell for added protection Fully adjustable ventilation Patent pending silicone pad technology system, SPIN (Shearing Pad Inside) Integrated vents to prevent goggles steaming up Personal size adjustment system Fixed goggle clip Certification CE EN 1077 Class B, ASTM F2040 Size Guide Head Circumference XS-S (CM) 51-54cm M-L (CM) 55-58cm L-XXL (CM) 59-62cm Measurement Guide Helmet sizes are based on the circumference of your head. To determine the correct size, wrap a measuring tape around your head. Once you've determined the measurement, you can use the chart here as a guide.