Our cover is used to protect your swmming pool&spa &hot tub &bathtub and avoid steam loss and keep ... spa cover, hot tub cover ,bathtub cover, swim spa cover, swimming pool cover ,lifter for cover ,PVC water pipe and related accessories ... PolyStyrene(EPS) foam cores for optimum strength and foam is vacuum sealed4) Gauge Aluminum C-Channel: Lighter, extra strength and corrosion ...