I was looking for knee high boots in grey and I was lucky to find these pair of boots. I'm 6'2" tall and these boots fall right down my knee (it's not exactly the knee but it works for me). I bought size 12 although I'm size 11 (I was not sure if size 11 would work so I preferred to have some buffer; although a size 11 might have fit well, size 12 fits good since I wear socks with them). Regarding the 2 zippers, I wasn't very convinced, but they look nice! I'm ~15" calves and the boot opening is just perfect; it's not needed to use the 2nd zipper. The material looks nice but after some wearing you would start seeing that the feet part is kind of marked (like wrinkles where you flex your feet), I would say that's the only non very positive comment I had; otherwise than that, you would love them :)