Re: Looking for Folding mats - 6'x12'
Hard to explain but AAI puts their Velcro on 1 way and the rest of the industry puts it on another - so they are incompatible. I 'married' AAI a long time ago.
Latest I have heard is the covering should be a thickness of 18 (not sure what the measurement is), older mats were 14 or 16.
If you are going to put them directly on concrete go thicker 2", if on a second floor that has hardwoods or carpet, thinner may be fine.
I have found some advertised - and have sold some old ones myself on a few Gymnastics bulleting board probably Craigslist a better place now....