I like these a lot. In the shower, they can stink though afterwards. I wore them in the yard to cut grass in as well. Not smart, but stay on flat ground. I think it smashes the heel down more when in the grass. Old ones not much sponge left. To improve the product, so to be perfect, antimicrobial, and less of a flat tire. However, if comfort is compromoised maybe shouldn't change it. Walmart dollar ones would have been 4 pair at least for one year use. I used these to walk around at the beach, around the house, in the shower. Do stink after a while, but put in some bleach water and clears it for a little while. Also acorns go right through. The tops of acorns, almost came through and walked on them but pulled it out but stuck in the rubber. Pieces of acorns too get embedded.