Umbrella Bases anchor umbrellas for safety and performance. We sell just the right base for your individual needs. Freestanding umbrellas require more weight, a larger diameter and a high stem to secure the umbrellas upright. When you use a table with your umbrella weight is required however the height under the table structure will determine which umbrella base to use. When umbrellas are used with a heavy table as a picnic table our UBrace is the perfect solution. The Ubrace can be used with an umbrella base on a patio table to keep it from flying out on a windy day.