Not Gel. Not Foam. Just Effective.® Corefit® Heat Moldable Custom Insoles have been handcrafted in the USA since 1932, bridging the gap between podiatrist prescribed custom insoles and flimsy store bought rubber, gel and foam insoles. Most mass produced insoles are fabricated from simple cellular sponge and/or foam rubber materials. These products may provide some shock absorption, but minimal (if any) therapeutic control or plantar fasciitis support. Corefit® Custom Insoles can be personalized to fit any individual foot in just seconds, by simply dipping them in hot water and custom fitting to the foot. They soften with moderate heating, allowing fitting to the foot, before cooling to their original, rigid state. Our custom insoles help prevent heel roll, provide support to high arches and promote better posture while providing proper weight distribution & relief from plantar fasciitis.