Gimo is made of lightweight and recyclable SEBS rubber, free from PVC. The removable lining made of our wool mix will keep the feet warm and comfy. Machine washable. This boot is a great complement to the child's regular autumn/winter wardrobe. As rubber is a material that doesn't breathe we recommend this shoe only as a compliment for cold rainy and/or slushy days.Guaranteed free of fluorocarbons.If you need an extra inner sock we have it, an extra sock will come in handy if the original sock gets wet or need to be washed.When Gimo is used without lining, please supplement with an insole. Also note that the inner dimension will be considerably longer without lining, about 1,7cm.