Nikken Kenko mStrides Lg/Men - Sizes 7-13 #20211 A major step forward in design and engineering, mStrides feature patented DynaFlux® Magnetic Technology and exceptional comfort. Patented DynaFlux provides 100% coverage and intensifies the magnetic field for greater depth. With mStrides in place, walking creates a dynamic energy flow — in effect, a magnetic field generator inside shoes. The mStrides surface is long-wearing, does not absorb moisture or odor and is ventilated to stay cool. These are the most advanced and durable insoles in the world. One pair supports wearers up to 275 pounds.