The Aerosoles Next Level Slip-On Shoe puts a twist on the basic flat shoe that everyone is wearing. Designed with a mix of fabrics and textures, this shoe blazes your trail with greater everyday performance style. Featuring a host of performance details including a removable sock with memory foam footbed for greater customization and a collapsible heel to convert into an even easier backless slide. Collapsible Heel Heel Cradle Removable Sock with high density memory foam Core Comfort Technology Scored Outsole Aerosoles Diamond Flex Sole.