Sleek, sophisticated, and classic, Reformation's Nylah Knee Boot is made from supple Nappa leather. It features a side zipper closure and an exposed seam from the knee to the square toe. Sleek, sophisticated, and classic, Reformation's Nylah Knee Boot is made from supple Nappa leather. It features a side zipper closure and an exposed seam from the knee to the square toe. Founded in 2009, Reformation is a revolutionary lifestyle brand combining stylish, vintage-inspired designs with sustainable practices. With each limited-edition collection, the LA-based brand empowers individuals who want to look beautiful and live sustainably.