Alterna brings smarts and style to home designArmstrong’s Alterna Groutable Premium Tile is designed for comfortable living: while it feels like stone or tile, its feel underfoot is actually warmer and softer. It’s also easy to clean, and it’s more tolerant of drops and accidents than stone or tile. These engineered stone tiles are made mostly of limestone with a high definition printed design and tough urethane finish. www.armstrong.com.