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.
Nishad.treehouse 5 years agoReply. Hai, There are diffrent types of soles, namely PU (polyurethane) Sole, Rubber sole, TPR sole, Leather sole, Plastic sole, sheet sole etc .. PU sole is very good and 's durable, u can wear it for more than two years, daily. am going to try to make my own shoes (and yes,if it works there will be an instructable) and I would also like to design custom soles. If you can get the material in pellets instead of sheets please tell me. One more thing, don't just say rubber. 'cause that's not witty that's just dumb.