It has been two weeks and the chairs have yellowed where they have been sitting in the water and an odd line ~1/3 down from the top (out of the water).  I have been looking for this type of chair for years.  I put them in my cart and then struggle to justify.  When I saw these by a popular Kid's Outdoor Toy brand, I was excited.  Two weeks later ... very disappointed.  I guess my only option is the expensive hotel versions.  I have never seen them yellow.