Once you've tried these patented foam sponges, you'll never go back to regular kitchen sponges again. Unlike most brands which are made from plant cellulose—a magnet for bacteria and mold—Skura Style Sponges are made with a fast-drying polyurethane foam and treated with an antimicrobial agent that discourages the growth of odor-causing bacteria. They also keep their shape over time and don't degrade or smell the way conventional sponges do. The scouring side is highly effective for scrubbing (we recommend using a lighter hand on your nonstick pans), while the soft surface is very even, which means excellent surface contact for wiping up messes. The pattern on the sponges will fade over time, but this is actually a perk: The Fade-To-Change® technology is an indicator that it is time to replace the sponge.