Oct 07, 2013 New SUPER ZERO Ninja Sox...what's the difference? We've received numerous requests to come out with a thinner version of the Original ZERO Sox. (Imagine the Original Zero Sox without the terry bottom.) So after creating several prototypes and testing out different materials and weave patterns, we came up with the SUPER ZERO SOX. The SUPER ZERO SOX features a thinner, non-terry sole for a flatter profile (great for boat shoes or slip-ons) and an improved flatter rubber band. In addition, they feature the non-slip silicone grip on the heel to prevent accidental slippage. As with all Ninja Sox, they still have the same craftsmanship and comfort you've come to expect.