I agree with Cash's mom. I think Quilters Dream Request wt.100% cotton will be just what you are looking for. Of course, I have come to use only Quilters Dream brand batting, various weights and types according to the project. It will tell you the appropriate distance between quilting on the package information and I don't know what that is right now, but you won't have any problems with bunching or shifting with use or washing.

Hobbs 80/20 had polyester in it.....far too hot for me because it doesn't breath very well. If you're looking for a very light weight batti g, try Quilters Dream. They offer several different weights and they all come in 100% cotton. I love their batting for lightweight quilts.

Agree with 80/20 Hobbs batting. Note that it is supposed to be quilted no more than 4" apart, so keep that in mind while quilting so that it won't come apart with repeated washings.

Another option is to use a good quality flannel with no batting. Wash it and dry it twice before using so that it doesn't shrink up. It is important to use a good quality flannel, which can be pricey, if you decide to do flannel.

I vote for washable wool too--it breathes so you don't get as hot and drapes so darn well.

Thanks for the tips, y'all!

I used to be a distance runner .. while menopausal. I learned early of cotton. It sticks and stays wet. Tech poly kept me dry, breathed thru most hot flashes, was warmer than cotton. But the best fabric I discovered was smart wool. Perfect with my hot flashes. It’s cool or warm when need be; it breathes; it stays dry. So, my next quilt will have wool batting. I’m going to try it. I’m tired of thinking my quilt is too warm or too cold.

One other thing not mentioned here is that how densely you quilt it will make a difference in how well (or not) it holds in the heat. Contrary to what I always thought, the denser the quilting the cooler the quilt. Quilts that are quilted with with larger open spaces hold more heat than quilts quilted with a lot of stitching.
This explains it well...
https://www.apqs.com/quilting-the-qu...g-is-too-much/

I suggest that you use a thinner batting (natural or poly) just because it will be easier to handle. Thicker can get trickier maneuvering it in your machine. But, it is your quilt. Other than learning a 1/4" seam, most of the rules are more of suggestions. You get to make the decisions and those decisions will improve with experience. Just making a quilt puts you far ahead of most folks. Consider many of your 'mistakes' simply adding design elements. But, not mastering a 1/4" seam, will create hours of frustration and yelling. Have fun!

I like to use bamboo batting for a summer quilt. It is truly thin and does not retain heat, but will keep you comfortable when the air conditioning is going.

I like Quilters Dream brand batting and would suggest their Request weight cotton batting. It is their lightest weight. I also have trouble with being too hot (medication side effects). I used their “Dream Orient” batting in it and have found it comfortable to sleep under even this summer. My daughter in San Jose, CA has been using a quilt I made with this batting for years. She says it’s cool in the summer and warm in the winter. It is a blend of silk, eucalyptus, bamboo and cotton. It is wonderful to work with, strong but very supple.