For the greatest comfort, we recommend wearing your new Vionic footwear for just a few hours for the first few days to allow your feet to adjust to the new level of orthotic comfort and support. Within one to two weeks you should find the product completely comfortable and supportive Upper: Leather or Nubuck. Footbed: Removable Microfiber Jersey Covered EVA Orthotic Insert. Outsole: Durable Rubber. SKU:H7717L3020 Vionic Womens Penelope Slip On Sneaker - Vapor