Our medical grade hydro gel glycerin is advanced liquid technology which provides arch support, absorbs heel and ball of foot shock, and constantly shifts position according to your weight and movement. The magnet in the insole helps increase proper blood circulation in the foot, helping to increase the benefits of the massaging liquid. This product will help reduce fatigue on tired feet, alleviate pain due to plantar fasciitis, metatarsalgia, diabetic foot pain or foot sores due to poor circulation. Simply remove your insoles from their package, cut down to size to fit your shoes, insert them and wear your shoes. They will go to work immediately and all day!