When forefoot pain strikes, add Metatarsal Pads to your Tread Labs insoles to support your metatarsal bones and take pressure off the balls of your feet. Backed with low-profile hook and loop, Metatarsal Pads attach to your arch supports and are easily adjustable so you can get the perfect placement. Made with open-cell polyurethane foam that is shaped for optimum comfort, Metatarsal Pad thickness is graded small Met Pad thickness is 2mm, medium is 4mm, and large is 6mm.