Blundstone Men's Super 550 Series 100% Leather Synthetic sole Shaft measures approximately 4.5" from arch Boot opening measures approximately 9.5" around UK 3,5 4 4,5 5 5,5 6 6,5 7 7,5 8 8,5 9 9,5 10 10,5 11 12 13 EUR 36 37 37,5 38 38,5 39 40 41 41,5 42 42,5 43 43,5 44 45 46 47 48 CM 23 24 24,5 25,5 26 26,5 27,5 28 28,5 29 29,5 30 31,5