I was excited when I first got these cushions.  They fit perfectly, were comfy, and the dark black color matched my dark black outdoor furniture exactly.  
However, although these are advertised as "outdoor" cushions, I don't think I would consider them for outdoors- unless they are in a shaded area.  My dark black cushions faded to a gray within 2-3 WEEKS!  
Again, the original color was dark black - as black as my chairs- and in the attached pix you can see the original color on the strap-that was tucked under the cushion, compared to the now faded base of the cushions- which used to be the same color as the strap. 
I expected them to fade over time- but not in 2-3 weeks.  I regret not spending the money on the "name brand" outdoor cushions. ;)