I bought 4 sets of the covers last summer.  They looked great when they arrived. I expected them to last for few years.  
The covers were used for 4-5 months to cover the chaises during the cold months. 
At the end of the winter, we took them off to find out all the seams disintegrated, and I mean all.  
I just reached out to Wayfair, and was offered 10 discount on one item, I was told they can only assist within 30 days of purchase.  This item simply fell apart, and no consequence whatsoever.  Maybe stop selling.