Specifications: Color Black Material PE Overall Dimension of S 2.5' x 10' Gross Weight of S 13.2 lbs Overall Dimension of M 2.5' x 16.4' Gross Weight of M 20 lbs Overall Dimension of L 2.5' x 20' Gross Weight of L 25 lbs Box Qty 1(May vary by batch)

● Enough length and width for high-efficiency heating
● Made of high-grade PE for long-lasting use
● Work well in the temperature between -20C and 90C (-1℉and 194℉)
● Good heat absorption for energy saving
● Allow you to swim with comfort in all seasons
● Firm connection avoids leakage
● Can be installed on the ground inclined frame or roof
●It is not recommended to use on the asphalt shingle roof