The yellow side is like a regular sponge and the green side is rougher like a scrubby pad. The yellow side is good for stuff that needs to be wiped down(i.e. countertops, dishes before the dishwasher, stovetops). The green side is good for things that have things stuck to it. Ever leave oatmeal in the bowl? Grab your sponge and use that green side. This is the same sponge that my parents have been using since I was a child, and now I use at my place. The price is reasonable and I know they work well, so why differ? Of course the only problem is that it will start to smell gross, so you need to make sure it dries out all the way or you'll be in for some stink.