Clearly marked 10 on the strap. my skin has never felt so good! Beautiful design and seem to be of good quality so dont be put off - just be careful what size you order. Lesson learnt - sticking with Bose products. Perfect boot for babies and toddlers! They are tighter than my other crocs. These sandals are amazing. Ps) I hardly ever write a bad review. It is not too bad. It looks like a darker smudge of pink.