If you wear size39 Leather Shoe，Please choose size40.<br />Note: Please check the Size Chart before you buy it.The size is China Size，please measure your foot length and according to you nation you will choose the right size.If your feet are wide and fat please choose a bigger size.<br />US 6=size:38=EUR size 38 2/3=UK size 5.5<br />US 6.5=size:39=EUR size 39 1/3=UK size 6