The LakeMat® is a carpet-like barrier, technically referred to as a benthic barrier, that is a highly effective and environmentally safe method of lake weed control. It is made of a weighted, proprietary fabric that rests on the lake bottom preventing any aquatic weed growth, yet allows water and oxygen to flow through freely. LakeMat® fabric is DEQ approved and guaranteed for five years against defects in materials and workmanship.