These non-woven, porous row covers are the best in crop protection against insect infestations, wind, emergency frosts/ freezes, and overwintering. Row covers help encourage extra earliness for the spring season and allow extension of the growing season into the fall, when prices are likely to be higher. They work by establishing a precise microclimate under the cover. Air, water and light easily penetrate this material. It can be used without support hoops, and the edges should be held in place with soil.