Cool Grey Concrete – 7237. Cool Grey Concrete is a modern addition to the Expona range, featuring beautiful and chic light grey tones and a subtle texture, for a more elegant look. An ideal flooring choice to enhance the appearance of a contemporary interior, these tiles will suit a commercial or a residential space with heavy foot traffic. The slip resistant surface and the waterproof construction make the tiles ideal for bathroom installations. A tough wear layer keeps the design shielded against scuffs and scratches, whilst also providing more warmth and comfort underfoot. These Polyflor tiles can be laid with matching borders or contrasting grout inlays, to create a more seamless or a more eye-catching visual effect.