Swing Demonia Cult DEMONIA "Swing 815" Knee high Boots Black Vegan Leather Demonia Cult Swing 815C Demonia Cult DEMONIA "Swing 815" Boots Black Vegan Leather Demonia Cult. Step into style and comfort with the SWING 815C platform knee high boots. Their 5 1 2" PF and durable metal buckles offer a look that is bold and fabulous, while the back metal zip closure ensures the perfect fit. Available in sizes 6 12, these boots will be your go to accessory for any special occasion!