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The soles are made of flexible and durable non-slip TPU plastic. Both soles have the same shape and adapt to the right and left foot when in use. The edges of the sole have a perforation where the upper is attached with the included thread. You can either sew the sole onto a pre-knitted or crocheted slipper, for example, or you can sew a stitch in the hole first and then crochet the top directly onto the sole, starting from the thread.
The included insoles are made of acrylic felt about 3 mm thick. If you are attaching the slipper bottoms to a finished woollen sock, you can slip the felt insoles inside the sock first, so that you can easily sew the edge to the bottom.