IDIFU Women's Warm Winter Slouch Flat Knee High Boots Comfy Shoes In this fall and coming winter, one pair of knee high shoes is a must for you. The shaft is approximately 16.5 inch, which can protect your feet and legs from coldness. The flat sole is of high quality, which is slip resistant and durable. It will never let you down. It's made of premium leather which is very durable and very safe for your feet. This pair of boots can fit any formal or casual occasions, which will make you more attractive.