New in box CHRISTIAN LOUBOUTIN Lock So Kate Leather Boots 100 size 39. Minor marks on the leather boots as seen in pictures. Christian Louboutin takes on a footwear classic with the Lock So Kate boots. Crafted from smooth leather, their classic ankle-length silhouette is elevated upon a stiletto heel, with a sharp pointed toe and a concealed zip adding timeless appeal. Any anonymity is at once withdrawn at the sight of the style's scarlet red soles, however – a signature that could only belong to the Parisian shoemaker.