Product descriptionThe Scout looks like it could withstand a bombshell hitting it, we can't promise that but we can promise this a really strong & safe helmet. The Scout comes with MIPS safety system, to give you more protection if you have a fall. The low profile fit gives you a cool look whilst the padding inside keeps it comfy. PLEASE NOTE THAT HELMETS ARE NON-REFUNDABLE AS IT IS AN ITEM OF SAFETY EQUIPMENT.Size Guide: (Sourced from Smith)SizeHead CircumferenceS51-55cmM55-59cmL59-63cmXL63-67cm Smith Scout Mips Helmet