I have the rubber boots for my two sons (5 and nearly 3 years) ordered in sizes 31 and 25 and they came just in time for our New Year holiday on the Baltic Sea. Before ordering, I had the feet of children measured again and the boots were a perfect fit. How to read in another review already, the liners are relatively slim cut, for both my children but just right, because this should indeed sit more closely, to warm. My children have certainly not extremely narrow feet, usually I buy width "means" or "IV". Especially my older son wanted his boots rather not take it off. Both were very well run with it and run. Also for the little ones, it is easy only to pull the shoes on and off, although they do not fall from the foot, as was the case with the much more expensive V *** g boots. Both children had warm and dry feet at 0 to 5 degrees. After a week of continuous use in salt water and sand, they show no significant signs of wear. The price-performance ratio is thus at least already times quite well if the boots keep the longer term, however, I can not judge. The Kolmax boots are certainly not a substitute for properly warm winter boots, but for me the perfect rubber boots for the cold season. For beginning runners are, however, m. E. as little suited as other Gummistifel also. In summary, my expectations were fully met.