3x12 entrance mats are ideal an ideal size for most walk off mats. If an 3' x 12' entrance mat that is designed trap moisture is preceded by a 3x12 walk off mat that is designed to scrape the end result is a very effective floor mat system. Studies have shown that with 18 lineal feet of properly chosen industrial carpet mats, buildings can expect to capture approximately 75% of the dirt and moisture BEFORE it gets tracked further into the building. Use 3x12 carpet mats for absorption and 3x12 floor mats that scrape shoes clean together for optimal performance. Should you need assistance in choosing the best 3x12 industrial runners for your building, please call us at 800-685-1144.