I wasn't very clear. I suggested the large piece to be used to cut what's needed to cover your seat. You should have a little left over. You could make a cardboard pattern, and use it to cut out the gel. I used a 3/4" thick memory foam against the plastic seat base, then a 3/4" gel over the memory foam, then a very thin (1/8") over the gel to keep it from sticking to the seat cover. So, overall it's around 1 1/2" thick. It will improve the comfort by leaving about 1" at the rear of the seat without any padding; and also make a cut-out of 3" wide by 5" long in the center of the seat, at the rear of the padding. That way, the seat will be supporting more your butt and less the tailbone. Also, use some of the padding in the front curved part to push the rider back, as needed. Experiment and change the padding to get the seat comfortable for you. I took my seat apart several times to get it like I wanted. Customize it to your (or your wife's) body. It's easy to remove staples and re-staple. After a couple of times, you'll find it's no problem. I used a $15 hand stapler and 1/4" staples ($5). Good Luck. Enjoy.