I would like to purchase this pair : https://www.asos.com/adidas-or.....vy/prd/109

However,

I feel 5.5 is too large, it slides when I walk, whereas 5 is too tight (but not really painful I guess)

A 5.25 would fit perfectly but alas, they don't make it

What can I do ? Do you have any experience with this kind of shoed ? Do they tend to break in ? Also, I am about 5'6. And I am worried a 5.5 will make my feet look ridiculously big

What do you think ?