A microwave safe product made of 100% Natural Cotton Batting. It is perfect for use in projects like insulated potato bags, casserole warmers and more. 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. IMPORTANT!! When cooking any vegetables wrapped in fabric, limit the time to two minute intervals. Pellon® does not recommend cooking on high longer than two minutes. When longer cooking time is needed, stop, turn the item, then start again. Never leave a microwave unattended while cooking. Use only 100% cotton fabrics and trims. We recommend pre-washing the 100% cotton fabric used for any project created with Wrap-N-Zap®.