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 outsole of the shoe is formed from a blend of synthetic rubber compounds. Nike shoes are unique amongst most athletic shoes in that the experimentation and design process for each new model of shoe can sometimes take up to 3 years.aterials. The production of all athletic shoes is divided into the making of the three main parts of the shoe: the top of the shoe, called the upper; the midsole, the part of the shoe that cushions and protects the foot; and the outsole, or, as most consumers refer to it, the sole.