Black Block Heel Ankle Boots The search for a comfortable high boot is over thanks to Tanga, the latest footwear offering from Carvela. In a classic black shade for versatile appeal season after season, this smart ankle boot sports a 28.5cm ankle circumference, 10cm boot shaft height and a raw-finished 8cm leather stacked heel that's contemporary, yet practical. Crafted from smooth and supple cow leather and finished with branded stud detailing, this trusty and timeless number also sports a textile lining, practical inside zip and a non-functional zip to the outside with a tassel zip pull feature.