Foot Petals Killer Kushionz are crafted of Technogel -- a patented, revolutionary gel like no other. Its 3-dimensional shock absorption diffuses pressure broadly across the foot, reducing stress on all pressure points. It will never harden, crack, yellow or develop odors. Technogel provides virtually invisible comfort that never goes flat and will outlast your shoes. Guaranteed. Our Killer Kushionz are 3/4 insoles that provide cushioning from heel-to-toe. They're perfect for open- and closed-toe shoes. Plus, they're reusable from shoe to shoe, and you can simply wash them with soap and water to restore adhesiveness. How's that for value?