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Protect your spa cover and further insulate your hot tubs water with the spa cover protective thermal insulating blanket. Place the thermal blanket on the surface of your tubs water before putting on your spa cover, the blanket will protect your cover from moisture, chemical vapors and heat while helping your hot tub maintain a more consistent temperature without using more energy. You can find this useful hot tub accessory at a great price with great service and quick shipping at HotTubWorks.com.