Hello, body measurements may vary from person to person, you can more easily determine the most suitable size for you by reviewing our size chart and product reviews. Adidas does not have straight production in odd numbers. Since the numbers grow by 2/3, the single numbers are 1/3 more, which is reflected as half. For example; 36, 36 2/3, 37 1/3, 38, 38 2/3, 39 1/3, 40, 40 2/3, 41 1/3, 42, 42 2/3, 43 1/3, 44, 44 2/3, 45 1/3 and so on. The numbers reflected as half are actually 1/3 in odd numbers and 2/3 in even numbers. Thank you for your interest.