The soles are made of plastic which is comfortable and durable. They have 5 magnets fitted which are specifically placed inside the soles to target key points in the foot. Adopts unique magnetic foot massager therapy, this provides you with foot massage and relieve fatigue. Magnetic therapy insoles massager, the position of the magnet is designed according to the areas of acupuncture and foot reflection. They stimulate foot pressure points and naturally increase pain and discomfort in everyday life. Reflex acupressure massage is effective in relieving pain fatigue by applying magnetic fields to specific reflex zones. It can improve blood circulation and better health. Magnetic therapy insoles are breathable is antiperspirant also to keep your feet cool and dry with 250 air holes to help improve health feet. The insole size allows you to cut, cut the insole according to the shoes with the scissors and place them in each pair of shoes. Material: PVC Size: S 35-40 (approx. 25CM) L 41-48 (approx. 29CM)