This round swing set rubber mat is made from a combination of vulcanized and natural rubber materials. Since both raw ingredients are of the highest quality, this under swing mat will exhibit excellent durability when used indoors or outdoors. Being a vulcanized (vulcanization is a process of cross-linking rubber molecules chemically) rubber product, this rubber mat will not shed or crumb up. It is a one-piece molded circular rubber floor mat. This playground swing mat is 9mm thick (just under 3/8-inch which is 9.5mm) and the diameter of the rubber part is 4 feet or 48-inches. This is a low maintenance product that is very easy to clean with most household tools and cleaning agents. For best results, simply use a wet cloth or mop along with simple commercial cleaning soap. The 48-inch diameter rubber swing mats is engineered from elastic and flexible rubber materials. Being water resistant, it will keep moisture off the surface off of your playground floor and will protect the areas that receive a lot of scraping and damage. By using an affordable rubber mat, you can improve the life of your playground floors and the aesthetic appeal of your playground, especially in problem areas that get a lot of abrasions. In general, rubber is the superior choice for outdoor use when compared to other materials, especially when the rubber mat is from natural rubber materials. While wood rots and splinters in the rain, rubber mats can withstand severe weather conditions, even snow. In addition, rubber will resist UV light and is durable, watertight, and fade resistant. This rubber mat is waterproof and when moisture or liquids are left on the surface, they will not get through to the bottom. This will protect subfloors from the damaging effects of water. This rubber swing set landing mat is an affordable way to protect your precious investments. This is the mat to put under a swing set when you need a focal point and to mark a landing spot.