Rigid top surface with low roll resistance for an "easy-glide" chair movement. Ecotex® polypropylene mats are guaranteed not to crack, chip, cup or shatter under normal use and correct application. Compatible with under floor heating systems. Not sensitive to alkali-based cleaning products used at their manufacturer-recommended concentrations. Quickly unfolds for instant use. Also ideal for easy storage and lifting when cleaning of flooring underneath. Easy and effective recycling properties for end-of-life re-use. Odorless and toxin-free. BPA-, PVC-, tin-, lead- and cadmium-free.