I don't know how they do this but I like it! Each skin is fused with a cotton interfacing which gives it some stretch. Sq ft compared with rough measurement in inches.

6.0 = 33 x 20

6.1 x 34 x 20

6.3 = 36 x 19

6.3 = 31 x 23

7.2 = 34 x 23

7.3 = 38 x 22 ( 2 count)

8.2 x 38 x 23

8.3 x 40 x 25