Clever idea! Zubits are magnet closures that turn your lace-up running shoes into slip ons! Do they stay closed? Yes! A special “magnetic array” is used on this patent-pending invention that allows them to bind with up to 17 pounds of force. Plus besides the Adult Strength size, which is adequate for running and gym work, there’s a Sport Strength size with bigger magnets and is best for high performance sports and speed running or for those over 190 pounds. The magnets will never lose their strength, so when your shoes are worn out, just transfer Zubits to your new pair of shoes. Choose from a wide selection of solid colors or buy multiple pairs to mix and match the colors for fun!