Soft, comfortable, and thin enough to fit in any shoe. Each innersole contains 8 embedded (not protruding) strategically placed, medical-grade 800 gauss magnets. These insoles contain nearly twice the magnetic power as similar products.Recommended for: In my practice, I have used these insoles to successfully relieve pain and swelling in the following conditions: arthritis, callouses, neuromas (nerve masses), heel spurs, and plantar fasciitis, muscle strain, and general foot fatigue.Note: Insoles may be trimmed to fit any size shoe.