Our women's black grounding flip flops are feminine, versatile and stylish for reconnecting with the earth’s natural energy when walking directly on the ground – grass, sand, soil, brick, and concrete (including city sidewalks). Each pair features a proprietary conductive carbon and rubber black plug under the metatarsal area (ball of foot) and a contoured arch support. Our carbon and rubber plug technology is unique to the Flip Flops. The Groundworks™ layered conductive technology is unique to our closed toed shoes. Size Note:  if your foot size is between sizes, we suggest ordering up to the next whole size. MATERIALS & CARE: Shoes that feature natural materials including but not limited to leather, suede, wool, shearling, etc. should not be worn in or around water. The natural materials found in these flip-flops are recommended for casual use in dry climates and have not been treated for excessive moisture or heat.