I emailed them and got my dollar refunded (two XLs plus an L). You’ll feel pathetic, but it’s the right thing to do. Or maybe it’s the wrong thing! To each his own.
FWIW the towels are a useful weight. I’ll keep my thin Packtowl for ultra-light ultra-compact use, but for anything where you have a bit more flexibility and desire a slightly more, eh, luxurious experience, this is a good weight (of fabric, and actual scale weight) and bulk.