Mad Mats&reg; Mix Indoor/Outdoor Floor Mat, 6 by 9 Feet, Rainbow These are the original Mad Mats famous for their lasting quality and sophisticated design Mad Mats are made of 100-percent recycled polypropylene and with polyester/nylon ribbon Strong enough to be outside all year without care; Beautiful and sophisticated enough to go inside anywhere Mad Mats breathe; they don't trap water so they won't mildew or rot wooden decks