Gel Activ Extreme Heels: Comfort for High Heels As the name suggests, Gel Activ Extreme Heels are designed to fit shoes with a very high heel, at least 5.5 cm high. The sole is anti-slip, ensuring it stays completely still in the shoe. Scholl's line of Gel Activ insoles for women's shoes effectively absorbs shocks and increases comfort by relieving pressure on the foot when it is under the most stress. Gel Activ technology provides cushioning and extra support for the heel and foot pads. Usage Instructions: For first use, remove the plastic backing. Check the markings indicating which sole is for the left shoe (L) and right shoe (R). Place the leading edge of the sole under the foot pad. Key Features: Fits shoes with sizes 35-40.5. Sold in pairs. Can be cut for a better fit. Experience enhanced comfort and support with Gel Activ Extreme Heels!