Umbrella bases generally consist of a one-piece base with an umbrella slot and may include spikes for in-ground installation. Some umbrella bases are made of a heavy metal such as cast iron, while others may be hollow plastic intended to be filled with water or sand, which provide the heft and stability needed to accommodate the weight of an umbrella.
Umbrella stands can be reused and generally do not need to be replaced with a new umbrella. Larger stands can be used for oversized or offset patio umbrellas. Having the correct size and weight stand is imperative, as the base stabilizes the umbrella.