Black Knee High Boots A boot that means business: Valentina puts an elegant finish to any day or night-time look. Set in classic black to complement any combo, this Carvela Comfort design is crafted from soft, suede with a 40mm kitten heel for high-quality comfort during wear. Nodding to one of the latest footwear trends with its curved toe and semi-ruching detailing, this knee high style has a slip on fastening to make for easy on/off.