We’ve been using these booties since my son was 1 and was ready to walk outside. He’s 3 now and has had them in grey, orange and navy blue, in every size from size 21 to 26. We love them. They are generally the only pair of shoes we buy in each size (except for wellies and a pair of sandals), which, for us, justifies the price. We take the thermal insoles out for summer and put them back in for winter and, because they are barefoot shoes, there’s minimal moulding to individual foot shape, so we can pass them onto his cousins.