This made me laugh (in a good way). I saw that a local company is making a yoga towel with the poses printed right on it, so you can’t forget what you’re supposed to do.
The company is RipSkirt Hawaii and the towel is called RipWrap. Towels are $35 each (or three for $90). It’s made from absorbent, quick-dry microfiber fabric “with a smooth finish that magically resists sand,” as the website claims.
I have not tried it so I can’t speak to that last bit, but if it works, that would be amazing in itself. Coat me with some of that finish, too.
Towel dimensions are 29” x 61” and it also features a flush Velcro pocket big enough for a cell phone. It comes packaged in a water-resistant self-sealing pouch. More at https://ripskirthawaii.com/products/ripwrap-travel-towels?variant=12869137596504.