Wrap N Zap is a microwave safe product made of 100% Natural Cotton Batting. When used in the microwave, it will trap the moisture inside to produce a perfect baked potato or a well steamed ear of corn. It can even be used for warming rolls and tortillas. Note when working with products intended for use in a microwave, certain precautions should be taken. Use ONLY 100% Cotton Batting, thread and fabric. Do not use batting that contains scrim. Do not use more than 2 layes of batting, even at the seams, Wrap N Zap is make of 100% Cotton Fibres without any additives. It is not fire retardant or flame proof. Never leave microwave unattended. Do not use Convection/Microwave oven. Washable by hand or machine. Do not wash batting until covered by fabric.