Bought the nike slider and must say it is incredibly comfortable to wear. It almost feels like i am getting a deep tissue massage when walking in them. Very good quality sliders and sturdy yet comfortable. I am a size 4 but I tend to wear thick socks in the winter so the 5.5 size fits perfectly though it is still tight around the width of my feet even without socks I think if you have wide feet it my be uncomfortable to wear.
These slippers are amazing, lightweight, comfortable and stylish. Bad designed slippers give me leg and foot pain but these don't. I struggle to find good slippers for my 2.5 uk size, I'm very glad I found them.