Specifically designed for REFINISHED or REGLAZED bath tubs. IT HAS NO SUCTION CUPS. SAFETY provided by standing or sitting so that the inverted raised cups press on the surface. SAFE FOR ALL AGES - young to the elderly. Will NOT damage your bathtub refinishing. Will not fray like rubber bathmats. Mold resistant. MACHINE WASHABLE in hot water. Provides guaranteed non-slip protection without damaging your bathtub.