hmm.... my poly batt quilts are much warmer than my cotton batt quilts. So that means I can turn down the thermostat at night, right?
Bamboo is an interesting yarn - like hemp, it continues to grow softer and more absorbant with each washing. I wouldn't mind trying it for a wall quilt or table runner, but I don't think I want to risk using such a new product in a larger quilt in which I have invested a lot of time and money.