Strong enough to be outside all year without care. Beautiful and sophisticated enough to go inside anywhere. * Mad Mats are made of 100-percent recycled polypropylene and with polyester/nylon ribbon. * All Mad Mats are packaged with handy velcro stays to keep corners down in windy locations. * Strong enough to be outside all year without care. Beautiful and sophisticated enough to go inside anywhere. * Mad Mats are made of 100% recycled Polypropylene and with Polyester/Nylon Ribbon. * Mad Mats are made of 100% recycled Polypropylene an with Polyester/Nylon ribbon.