Enough length and width for high-efficiency heatingMade of high-grade PE for long-lasting useWork well in the temperature between -20°C and 90°C (-1℉and 194℉)Good heat absorption for energy savingAllow you to swim with comfort in all seasonsFirm connection avoids leakageCan be installed on the ground inclined frame or roofSpecificationsColor - BlackMaterial - PEOverall Dimension of S - 2.5' x 10'Gross Weight of S - 13.2 lbsOverall Dimension of M - 2.5' x 16.4'Gross Weight of M - 20 lbsOverall Dimension of L - 2.5' x 20'Gross Weight of L - 25 lbs