Sand and dirt fall straight through the mat to the ground beneath, but not back up through the mat. The CGear Multimat is ideal for outdoor living areas and provides a sand and dirt free area for camping sites. TheMultimat can be used as a shade mat (providing 90%+ UV protection) and as windbreak break mat for screening. Designed in Australia for Australian conditions. The CGear Multimat is lightweight and easy to set upand pack away. Made with reinforced edges and using D-Rings to peg down, the Multimat is durable and won't tear or fray, even if cut due to rip stop technology. Each Multimat also comes with its own drawstring carry bag.