These covers are working out really well.  We don't have an area where we can store our outdoor rocking chairs so last winter had to leave them on the front porch.  Because they were uncovered the white chairs seemed to collect all the gunk that must have been flying through the air during the winter months!  It took a great deal of scrubbing.  This upcoming Spring I should just need to hose off the chairs because of the new covers, and they will be read to go for the season.