Not smooth felt or wool. It really is a small miracle with this kid, and we are SO happy to have found something that prevents us from buying new earphones every month for our much loved Cord Killer! Over the years, I had seen Vionics sold on QVC, but never felt the need. Its tough to get the garment on, but once its on I think its pretty comfortable and really holds me in which is great. Parecen robustas y duraderas (1 par lleva ya 300 km en tierra y asfalto y están todavía bastante nuevas. We got two of them, this and the Amazon special black and red edition, to use them paired up, as advertised. Its also extremely important. I really need to look into buying these in other colors. I never saw this type of shoe storage until I found it here. Me entregaron el producto, todo bien, funciona bien, pero venían sin caja.