This is a seriously practical shoe to wear about, this is not something you find in stores - I first spotted this type of shoe at a shoe repair shop. ya que si lo subes mas de 90 una bocina (de las pequeñas que debe tener integrada) suena muy mal. Very easy to install, 1 integrated Allen socket at each end to tighten to the rails, took me about 10min to get them where I wanted them. Recomiendo pedir una tala más grande. Considering I bought this yesterday and it has arrived so quickly AND it in seemingly perfect working order, I would say I highly recommend this purchase. When I go without socks, they feel almost loose by comparison, but not so loose that theyd slip off. As expected. Shipper arrives at 10 pm. Came with no instructions so I have a box full pieces! AVOID