Holes added for an umbrella.
Elastic is available on round sizes only.
42x42, 52x52, 52x72, 52x90, 52x108, 52x120, 52x144, 52x168, 52x192, 52 Round, 62 Round, 72 Round, 90 Round, 108 Round, 120 Round, Custom sizes may be ordered also.