Ajvani Women's High Chunky Heel Lace Up Calf Knee Military Biker Boots Size 6 37 Synthetic Synthetic sole Sizes displayed on the shoe are in UK or EU sizes. US 5 = UK 3 / EU 36 -- US 6 = UK 4 / EU 37 -- US 7 = UK 5 / EU 38 -- US 8 = UK 6 / EU 39 -- US 9 = UK 7 / EU 40 -- US 10 = UK 8 / EU 41 9.5 cm (3.7 Inches) Heel Height 39.5 cm (15.5 Inches) Shaft Circumference 37.5 cm (14.7 Inches) Shaft Height Lace Up / Zip Fastening