I too get very warm/hot under the covers so I have come to use Warm and Natural batting most of the time. It is a light weight cotton batting very easy to quilt either by machine or hand. It is unlikely to bunch up. I have quilts that have been through the wash a number of times over 20+ years and have not shifted. It is easy to sandwich and prepare for quilting too. I will use a poly bat for other things like wall hangings or even baby quilts. My preference though is W&N.