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.
Running Shoes. The minimalist running shoe sole is a new trend in the sport. The rubber on minimalist soles may be as thin as 3 mm and is extremely flexible. Proponents of minimalist running shoe soles say that the increased flexibility of these soles allows for a more natural heelstrike, but offer the least cushioning and impact absorption.