Carpet and Rug padding/ underlay

I have two very good pieces of carpet underlay. The picture reflects shadows or slight wrinkles. Wrinkles will, of course, be pressed out by a carpet over top. These raise your carpet, a few millimetres giving it more softness and aeration for longevity and better air quality. One is 42 x 64 inches for $15. Another is 45x 67 inches for $18