Heel spurs and plantar fasciitis are often confused, but we understand the difference. Tuli's Dual Density Heel Cups were developed for the true heel spur sufferer. With just one look you can see the strategically placed blue shock-absorbing design inside a ring of soft, comfort-providing TuliGel. The ring acts as a cradle, distributing pressure to the outer edges of your heel - away from your injured area. From Medi-Dyne.