MSPA Hot Tub Jacuzzi Heat Preserver & Rain Outflow Bladder Cover Round Fits All Round Mspa 4 People 140CM Diameter

The M-Spa hot tub round inflatable bladder not only helps water heat retention but also keeps unwanted rain water out. Inflate the bladder and rest it on top of the water (under the cover), this provides better heat preservation and prevents sagging so the rain water can run off.