Fits the center post. Umbrellas that are square up to 360 cm and rectangular up to 400 x 300 cm A rod is included for convenient fitting over the umbrella while standing next to it. It fits cantilever octagonal umbrellas up to 400 cm, square umbrellas up to 360 cm, and rectangle umbrellas up to 400 x 300 cm. Fully Waterpro full-length zipper with bottom string pull