Use this 20x40 foot rectangular in-ground clear solar blanket to heat your pool faster. The blanket is laced with air bubbles that act as an insulating layer, shielding your pool from cool winds and nighttime cooling. In addition, since the blanket is clear rather than a color, it allows more solar heat to reach the depths of your pool and heat it thoroughly. This blanket is made of extra-thick 14-gauge material so it will outlast most other in-ground blankets on the market. Backed by a 6-Year Warranty.