We are offering ultra vent head protection helmet. Suspension - 4-point textile cradle with plastic headband having slip fit or ratchet fit adjustmentchin strap - adjustablesweat band - brushed cloth on foamsize : 53 - 60 cm key features:-design - lightweight aerodynamic design with x-ribs across thehelmet shellall face protection accessoriesstandard - is:2925:1984 isi marked