Measure your outdoor furniture so you can achieve a proper fit for the covers. If the furniture cover is too small, it won't protect your furniture properly. If it is too large, it will allow the rain, snow, wind and debris to get underneath the cover, potentially damaging the furniture. For proper measuring, slide chairs in under the table as close as they will fit. Measure the height (ground to the top of the chair backs), the width (front to back) and the depth (one side to the other). Also, determine the proper angle or slope by adding the height to the distance from the front of the chair to the ground.
Purchase premade furniture covers to match the dimensions of your measurements. The most protective fabric is vinyl with a polyester lining. Velcro closures for the legs/arms of your furniture will provide the best fit and the most protection. If the table has a hole for the umbrella, the cover should fit inside the hole snugly to prevent moisture from seeping under it.
Clean the furniture before covering to prevent staining. Let it dry thoroughly before covering to avoid locking in the moisture.
Spread the furniture cover over the furniture, making sure the furniture is completely enclosed. Pull the fabric snug and close with Velcro closures. If any area is left unsecured, the furniture could be exposed to the elements, causing damage.