Leatt - Gravity 1.0 V25 Helmet (MTB)FULL FACE HEAD AND BRAIN PROTECTIONThe Leatt MTB Gravity 1.0 is a full-face helmet with solid protection. The focus of this helmet is premium 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.Air vents are not covered, which make this helmet well ventilated. Ideal for warmer downhill or bikeparks days.Get full face head and brain protection at an amazing price.Downhill certified ASTM polymer shell in three sizesGreat ventilation360° Turbine TechnologyReduced peak brain acceleration by up to 30% at impact speeds associated with concussionReduces peak brain rotational acceleration by up to 40%breakaway visor function for additional rotational impact force reduction Impact foam for superior energy absorptionWashable inner linerOptimal neck brace compatibilityCertified and tested: AS/NZS 2063:2008, ASTM F1952–10, EN1078, CPSC 1203Weight: 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") #XL (61-62cm – 24 – 24 ½") #XXL (63-64cm – 24 ¾ - 25 1⁄5")