I do wish it better fit my mattress. I tried centering the topper leaving 2 to 3 inches short at the top but I lost my pillow each night :( I have it pulled up to the top of the mattress now but my 6'4" hubby wishes it went to the bottom of the mattress. Fits perfectly from left to right. Very comfy. Really helped with MS pain. I put it under my mattress pad and I don't see the green.