After initial happiness at paying the premium for Sperry, the heels have collapsed.  That's right, the sole is no longer solid rubber, but an energy-absorbing piece of swiss cheese that permanently broke down within 5 months, leaving a hard ridge of solid rubber pressing up against  the back of one's foot arch at the front of the heel, visible as the straight line across the heel bed in this photo  Very uncomfortable.  Now to test Sperry's definition of 'manufacturing defect'.