Mike, I added about 2" of foam , closed cell below stock foam, high density open cell foam above stock foam all crudely shaped with a belt sander. I added this to my bike's seat since my fanny lacks enough of it's own padding. Covered it all with stretchy neoprene from the fabric store and then with paint roller added the gripper top using RTV Silicone to keep me from sliding into to low front. I wanted to sit a little taller in the saddle so transitioning from sitting to standing entails a few less degrees of creaky knee bending.
Sand foot was a handle from a 2" gate valve I secured with a bolt should I wish to remove it. I have gotten tired of having to remember to park next to some stick or rock in soft terrain. Should you wish to remove it for a "souvineer" bring a #2 Phillips and a 10mm box wrench when I am not looking.