Spenco® Performance Gel Metatarsal Arch Cushions provide support and comfort for the metatarsal arch. The dual density Thermoplastic Rubber Gel provides superior cushioning and energy return for ultimate performance in any type of footwear. An antimicrobial top cloth helps keep the cushion in place and eliminate odor causing bacteria while the anatomical cushioning system absorbs impact and shock where the metatarsals need it most. One Size Fits All. One Year Unconditional Guarantee.