Grog (clay) Grog, also known as firesand and chamotte, is a ceramic raw material. It has high percentage of silica and alumina. It can be produced by firing selected fire clays to high temperature before grinding and screening to specific particle sizes. It can also be produced from pitchers.
1 Excellent Support- Every single KURU athletic shoe offers the most supportive design available. Our HEELKRADLâ¢ feature centers the foot to cushion each strike of the heel and absorbs shock with each step.  Durable Construction- Long lasting, dependable shoes will improve your training on any surface.
The technology makes for an extremely comfortable, supportive shoe. So they bill these things as having the world's most anatomical midsole.. The idea is that the Kuru sole is made out of stuff that enables the shoe to mold to your foot, offering the support of a custom orthotic..