Wellies Online understands what kids need in children's wellies. We get it! That's why we've developed Welly Flexisoles. These gumboots have a flexible rubber sole, so your children can really jump in puddles.. And we appreciate that toddlers enjoy splashing too. That's why our smaller sizes have a flexible sole. These gumboots have a skid proof tread, which bends readily with each step. Whilst older children can enjoy the durability of tougher soles. Our wellies are natural rubber and fully lined.