The trainers you are referring to are either womens, or childrens. I assume most likely to be womens based on the sizes currently available. http://www.very.co.uk/nike-air-max-zero-essential/1600161863.prd?_requestid=32026&Ntt=air max zero The sizes on the link in this messages are 3,4,5,5.5. So the two products are different, even though they look the same.
49 squids on very with free post