The Robelle Olympus Winter Pool Cover is an extra heavy-duty solid winter pool cover. Solid pool covers do not allow water to pass through their material. The Robelle Olympus Winter Pool Cover features an extra heavy-duty 13 x 11 scrim. The extra heavy-duty polyethylene material used for this cover weighs 3.6 oz./yd2. Both the scrim count and material weight are the best indicators of the strength and durability for your pool cover. This is an extra heavy-duty pool cover designed to protect your pool from the winter elements. This cover is constructed with Rip-Shield Technology that will prevent small rips from becoming larger tears. The Robelle Olympus Winter Pool Cover features a 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 five-foot overlap. Please order a larger size cover if you have steps (or any other irregularity) protruding from your pool. Water tube loops are placed around the perimeter of the pool cover. Water tubes sold separately. Only water tubes should be used to install this pool cover. No other method of installation is recommended. 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. Includes a twenty year warranty.