I am making a quilt for my gown up son. I showed him another finished quilt and he asked if I could put two layers of batting because he didn't think it was heavy enough. I will find someone to quilt it on a long arm and wasn't sure if two layers would be possible. Is it? Batting will be cotton.

It isn't a problem at all to use two batts. Many wholecloth quilts have two batts.

I have sent quilts to Long arm quilters with double battings. I used a cotton on the bottom and a low loft poly on the upper layer. it came out great. The low loft gave just a bit more definition to the quilting, plus some added warmth.
My Long arm person had not done this prior , but she also loved the effect.
If your LAQ does not want to try this and it is warmth you are going for.. use a wool batting. VERY warm. I have done several wool batting quilts...they are much much warmer than the cotton. They do have a bitmore loft that a cotton and will show of the quilting nicley.

Lori- is the wool itchy ??? Maybe between fabric it wouldn't be? I don't know. Let me know, thanks!

Not a bit scratchy or itchy. try it .. I really think you will like it... sorry for the late response .. out of town visiting my Mom .