The KOHLER® Ballast shower base makes installation simple, whether you're remodeling your bathroom or planning for new construction. The ultra-low threshold creates a sleek appearance and eases getting in and out of the shower, while durable resin concrete core construction provides a solid, quality feel underfoot. A smart alternative to tile, this one-piece 48" x 36" acrylic shower base offers easy maintenance and less risk of leakage.