Easy Air Space!
If you're using fabric pots because you understand the benefits of air pruning, you've probably been experimenting with ways to let the air get under the pots. There are various ways to do this but possibly none so easy and effective as the "DekProTek."
They also protect decks and floors from moisture damage, evaporate condensation, and help keep roots cool. And much more elegant than the recycled baby gates I've been using under 15 gallon fabric pots whose corners keep tripping me! Also good for under clay saucers.