Thigh-length boots are boots that rise to a level at some distance above the knee. They were originally associated with the fetish footwear, but since 2003 they have become a more mainstream fashion. However, these boots still draw on the fetish origins of the thigh-high boot.
In its fetish form the boot is usually made from latex, leather, lycra, spandex, or vinyl (PVC). Depending on the material thigh-high boots have different methods for putting them on. Leather and other stiffer materials need a zip in order for the wearer to fit their leg inside the boot. Stretchy material enables the wearer to squeeze into them without the aid of a zip.