The Crocs Alaina Flip Stream combines the comfort of Crocs with the cool, casual style of a flip. It has a sculpted outsole which creates a rocker effect as you walk ... our customers say it's like walking on a cloud! . -Croslite material straps for support. -Footbed features Croslite material circulation nubs for a massage-like feel. -Spherical outsole design helps moderate movement and provide stability and support.