What is the difference between Premium Mats and Premium Extreme Mats, besides the dimensions?

There are many differences between the Premium Mats and the Premium Extreme Mats. One of the first differences is the thickness, the Premium Mats are 8mm and 3/8" thick, whereas, the Premium Extreme Mats are 3/4" thick. The surface of the Premium mats is smooth, whereas, the Premium Extreme Mats have a textured top. The last difference is the size of the mats. The Premium Extreme Mats are a bit smaller than 4' x 6' at 47" x 71", whereas, the Premium Mats are 4' x 6'.