First，you need to measure your foot length ，next，please according to your foot length to choose shoe size.<br /><br /><br />shoes EU Size 38 = UK 4.5 = US 6.5 = Foot length (bare foot) 240mm<br />shoes EU Size 39 = UK 5 = US 7 = Foot length (bare foot) 245mm<br />shoes EU Size 40 = UK 6.5 = US 7.5 = Shoes Inner length 250mm<br />shoes EU Size 41 = UK 7 = US 8 = Shoes Inner length 255mm<br />shoes EU Size 42 = UK 7.5 = US 9 = Shoes Inner length 260mm<br />shoes EU Size 43 = UK 8 = US 9.5 = Shoes Inner length 265mm<br />shoes EU Size 44 = UK 9 = US 10 = Shoes Inner length 270mm<br />shoes EU Size 45 = UK 10 = US 10.5 = Shoes Inner length 275mm<br />shoes EU Size 46 = UK 11 = US 11 = Shoes Inner length 280mm<br /><br />Shoe type: Climbing shoes<br />Applicable object: Male<br />The upper height: Low<br />Side material: Head layer cowhide<br />Lining material: Gore-Tex<br />Outsole material: vibram rubber<br />Closed mode: Lace<br />Midsole material: EVA<br />Insole material: Ortholite<br />Function: Shock Non-slip Wear-resisting Ventilation Sweat<br /><br /><br />If you want make a very correct choice you should choose by the size chart at the image !!!<br />The relation of foot length between EUR&US size as the pic shows ，Please choose <br />the right size according to your real foot length <br /><br />I wish you a happy shopping experience on Wish!Have a nice day!!!<br /><br />