Nedia Home Acanthus Border with Rubber/Coir Doormat, 24 by 57-Inch, Monogrammed Z The nonskid rubber backing keeps the coir from shedding and keeps the mat in Place. These Mats bravely stand up to any amount of foot traffic. Coir fiber is naturally mold and mildew resistant. These Mats are made from renewable natural materials, coir and rubber, and is Environmentally friendly and biodegradable.