The Robelle Value-Line Winter Pool Cover is a solid winter pool cover. Solid pool covers do not allow water to pass through their material. The Robelle Value-Line Winter Pool Cover features a 7 x 7 scrim. The polyethylene material used for this cover weighs 2.2 oz./yd2. The Robelle Value-Line Winter Pool Cover features an azure blue topside and a black underside. Please order by your pool size, as the overlap goes beyond the pool size listed. This cover includes a three-foot overlap. If you have a large top rail, please consider a larger pool size. This cover should be able to comfortably float on the pool water without excessive stress. This cover is not meant to be used as a debris cover during the swimming season. This winter pool cover is intended to be used during the off-season. This cover is meant for traditional above ground pools with a traditional top rail. Includes a winch and cable that should be used to secure your pool cover through the grommets around the perimeter of the pool cover. For extra securing, cover clips and cover wrap (both sold separately) are suggested for pool closing. No other method of installation is recommended..