Coolaroo Market Umbrella, Patio Shade Umbrella, 90% UV Block, Round 11' with Adjustable Tilt, Mocha KNITTED shade fabric so it is not waterproof. Designed to reduce temperatures underneath by up to 32. Knitted fabric provides up to 90% UV block while letting air flow through the fabric. Has a premium crank mechanism and tilt system which allows you to angle the umbrella to block sunlight at various positions. The pole is designed to work with tables or pole configured umbrella bases. Pole diameter is 1.75 and is powder coated aluminum; (Note: Base not included.)