Reduce soil temperatures, prevent bolting and bitterness of heat-sensitive crops like lettuce and spinach, and protect pepper and eggplant fruits from sun damage. UV-stabilized black polyethylene is naturally rot and mildew-resistant. This lockstitch knitted cloth is lightweight with improved ventilation and water permeation when compared to woven shade cloth, and can be cut without unraveling. Use 50% shade cloth in hot, southern areas and for shade-loving plants. Blocks 50% light transmission to crops. 20' width is ideal for use on high tunnels. 5–7 year lifespan. NOTE: Always hang shade cloth above the plants to provide adequate ventilation so heat does not build up beneath. Please allow 7–10 days for delivery.