To add to Needles comment. Be careful with the batting - much of the cotton batting that you think is 100% cotton is not. Check the contents label, it may say 90%/10%. Also, we sell hundreds of these sets and we attach a little tag that says 'Warning - use for reheating, 3 -5 minutes only'. And yes, not only does your fabric and batting need to be 100% cotton, but also your thread. We have only had one person come back for a refund because she said it 'burned' in the microwave. We pointed out the mark was exactly the shape and size of the pin used to hold the tag. Her response was that she didn't know she had to remove the pin!!!!! We refunded her anyway, bless her heart.......