Thigh-length boots, known also as thigh-high boots or simply thigh boots, are boots that extend above the knees. Other synonyms include over-the-knee boots (OTK boots), and especially when cuffed, pirate boots. Lengths vary from reaching just over the knee to reaching almost to the crotch (referred to as crotch boots).

Like all boots, thigh boots are made of different materials ranging from various leathers, to various synthetic materials (vinyl, polyurethane, or latex), to various fabrics (silk, polyester microfiber). Many are constructed with zippers for ease of entry, but some are constructed as pull-on boots. Heel heights vary, but the majority are sold either as flats or with heels greater than three inches (7.5 cm). Heel styles vary from metal spikes to chunky. Like other boots, they can also have platform soles.

A number of couture shoe design houses regularly include thigh boots in their collections, and the price point will be at a premium, just as with the couture fashion designers. Example designers include:

Brian Atwood
Manolo Blahnik
Jimmy Choo
Christian Louboutin
Sergio Rossi (of Gucci Group)
Stuart Weitzman
Giuseppe Zanotti (of Vicini S.p.A.)
Couture fashion designers regularly use the shoe design houses to design the boots and shoes for their collections.

Thigh boots are a regular staple of several Italian boutique brands. Examples of such brands include the following:

Gianmarco Lorenzi
Left and Right
Le Silla
Loriblu
Icône
The price point for these boots can be very high, particularly at retail boutiques, but will vary more than for couture designers. Some brands are available through eBay sellers and clearance sellers (e.g., Yoox) at discounted prices.

The lowest price tier is typically the fashion retailers. Examples of retailers who regularly include thigh boots in their line include:

Aldo
Bebe
Victoria's Secret