Kikkerland Rainbow Coasters

We first used these colorful coasters on our recent trip to Turks and Caicos and just had to buy a set.  They solve one of the most annoying problems coasters have, that being lifting off the table with the glass.  The soft, rubbery-like material will stay put on smooth surfaces like our patio table while doing its primary job of keeping water drops off the table.  Eight coasters in eight different colors, for ten dollars.

https://www.amazon.com/gp/product/B074HBYYB2