Made of cotton and rubber. Sturdy rubber sole lets you step outside the house to grab the mail or walk the dog without switching shoes. Non-marking and noiseless on both tile and hardwood floors. Memory foam insole conforms to the contours of your foot for pillow soft comfort; pamper yourself after a long day at work, or that hard working husband or Dad in your life by giving his tired feet a well deserved rest. Knit upper ventilates the interior, letting your foot breathe and stay sweat-free; machine washable for easy care. S, M, L, XL.