Brilliant - worth every penny for no stress. Bought for 20 month grandson with wide feet. His Mum struggled to put wellies on. These are a dream. Materials looks and feels like slipper material, but is totally waterproof. In recent UK snowfall his feet were totally warm. There is a gap at the back where the fastener pulls over, which I imagine would let the water in if jumping in deep puddles.
Got the size 3 at first and they were too small. Returned them and ordered the size 4 but found that these ones match a size 5 toddler ? My son is a 3.5 F and will grow into it, but I got them for this winter, so am a bit disappointed for that reason only. The boots are well made, soft, and seem comfortable and warm.