I always used the polyester batting until I found Bamboo. I am in love with it. I also only purchase it with the 40 or 50% off coupon though because it is much pricier than the polyester. I never knew until I found this board that polyester batting was "bad". It wears forever. But I really like the bamboo so don't think I'll go back to polyester. I have a batt of cotton to try and an 80/20 I am going to try as well. I say try it all and use what you like.