The Birkenstock Amsterdam Classic Clog is made mainly for indoor use as the materials that have been used are not meant for outdoor use. The materials in the uppers of the Classic clog are made from wool and covered with felt. These materials are not used for outdoor shoes as it is not very durable outside.
The sole of the clog is made from EVA and this is the same sole as those for outdoors. When you look at the classic clog you note that they look like a standard slipper. All the felt in this indoor classic clog is made from red felt while the wool the colour os called petrol which is a reddish colour. These indoor clogs are made for children and comes in British sizes being 32 and 33. If you are looking for an indoor clog for your children then this Birkenstock classic clog is great for indoor use by kids.