DeWitt Deluxe 20" x 30" Pond Netting is an environmentally safe polypropylene material similar to DeWitt"s knitted shade fabric used by many greenhouse growers. Deluxe Pond Netting is constructed with 1/4" mesh knitted strands that are bonded together. It is much stronger and more durable than the old 3/4" mesh net that this product replaces! It is also UV-treated for long life in the sun. Helps keep leaves, debris, predators and children out of ponds.