WaterHog mats are durable, stain-resistant mats with a unique bi-level design that traps dirt and moisture, keeping your floors clean, dry, and safe. CLEAN & DRY | Bi-level surface effectively scrapes dirt and moisture from shoes, trapping it beneath shoe level to prevent tracking; water dam border holds moisture keeping it off your floors (WaterHog mats can hold up to 1. 5 gallons of water per square yard). Dimensions: 59" 35". Rectangle shape, PET Polyester with Rubber Backing. Rectangle. SAFE | Certified high-traction by the National Floor Safety Institute (NFSI). Post Consumer Content: 60%. Recycled Content: 60%. Limited Lifetime Warranty. Made in the USA. Please note, mat sizes are approximate as rubber shrinks and expands in conjunction with temperature and time. Tolerable manufacturing size variance is 3-5%. Smooth backing is recommended for placement on smooth floors, such as hardwood or tile. Cleated backing is recommended for placement on carpeted surfaces. Universal backing can be used on either smooth or carpeted surfaces. This Waterhog Andersen indoor mat has non-skid rubber backing for user safety.