Leatt: The Leatt Gravity 2.0 helmet is full-face, head and brain protection. The focus of this helmet is superior safety and great value. Featuring 360 Turbine Technology, the helmet is lined with turbines which are 360 moving discs constructed from an energy-absorbing shape and material, this tech has two exclusive advantages, namely the reduction of rotational acceleration to the head and brain and the absorption of energy upon impact at concussion level. This helmet comes with a premium liner for long lasting comfort and moisture wicking properties. The vents are also covered with a stainless steel mesh. This offers more protection from stones, dirt or bad weather. Get supreme full face head and brain protection at an amazing price. Downhill certified ASTM polymer shell in three sizes Stainless steel mesh vents 360° Turbine Technology Reduced peak brain acceleration by up to 30% at impact speeds associated with concussion Reduces peak brain rotational acceleration by up to 40% breakaway visor function for additional rotational impact force reduction High quality inner liner for all comfort in hot and cool weather climates Great ventilation Double D ring chin strap Impact foam for superior energy absorption Premium washable inner liner for all-day comfort Optimal neck brace compatibility Certified and tested: AS/NZS 2063:2008, ASTM F195210, EN1078, CPSC1203 Weight: From 960 ± 50g (2.12 lbs) Sizing #XS (53-54cm 20 ¾ - 21 ¼") #S (55-56cm 21 5⁄8 - 22") #M (57-58cm 22 ½ - 22 ¾") #L (59-60cm 23 ¼ - 23 5⁄8")