A very common foot problem (especially among women) is a condition called Morton's Neuroma. Numbness or a stinging sensation occurs in the ball of the foot - usually between the base of the third and fourth toes. This occurs when a nerve becomes irritated and swollen. These ultra-thin silicone metatarsal pads help ease the discomfort by evenly distributing the force you place on your forefoot when you walk. The pad design secures a dome under the foot in just the right place to support your foot's metatarsal arch (that indentation in the center of your forefoot). The silicone contains anti-bacterial, anti-viral and anti-fungicide properties that inhibit odors.. We highly recommend this for individuals who do a lot of walking or who stand for prolonged periods of time. Specify men's/women's shoe size.