I usually wear a 12 for these type of trainers and never had an issue with Adidas shoes. unfortunately these ones I exchanged them for a 12.5 and still not feeling right. My left foot is slightly bigger and wearing these shoes feels very uncomfortable and painful even with the thinner socks I have but now I've worn them too much to return them. the description should say small fit and order a size up. I'd say they are too wide as well so for my narrow feet not the best fit especially if you use them for badminton/pickleball. Overall very disappointed with this purchase.