You could cut it down to two and a half inch.
If it works, great.
If it doesn't, you weren't going to use it anyways.
BlueDragon wrote:
https://www.google.com/search?q=wicking+fabric
A moisture-wicking fabric has two jobs: one is quickly moving (or wicking) sweat to the fabric's outer surface, and the other is drying rapidly so that your sweat doesn't saturate the fabric.
You might want to consider Kiralynx's "brandy keg" Frankenstein.