If you are looking for the best umbrella you can buy that will clamp onto your beach chair, then look no further. These are top quality clamp on umbrellas made by the industry leader in umbrellas, Frankford. Enjoy a relaxing day at the beach without all the exposure to the sun. This umbrella opens up to be 36 in diameter and 44 in height. With several colors to choose from, this is a great umbrella without breaking the bank.