Wobbi Alex all-weather boots will keep your child's feet warm and dry even when it's really cold outside. Of course, they also come with a snow lock to prevent snow and other dirt from getting into the boot when the kids are running around and playing. The boots are completely molded in the material EVA copolymer which is a very durable material but unlike many other boots has a very low weight. The low weight of only 200 grams (size 30) means that the Alex boots quickly become a favorite at home as the children don't have to play in clumsy boots. Of course, EVA copolymer contains no toxins. Our boots also do not contain PVC, which means they will not crack in the cold. However, the material is sensitive to high direct heat, so we do not recommend drying the boots standing on the floor in a drying cabinet or similar. The boots are equipped with a snow/dirt lock at the top to prevent snow and mud from entering the boots, they are easy to tighten with a drawstring. Of course, we have also put a reflector on the heel so that your child can be seen better at night. The measurements in the size chart are the inside measurements of the boots. We recommend having a 15-20 mm gap in addition to the inner dimension. The sizes are normal according to over 400 satisfied customers who left a review about how they feel about the size and fit.