Power Balance Evolution Wide Wristband Great-Looking Wristband for Athletic or Everyday Use Breaking away from the mold, the new Evolution Bands are bold, streamlined and perforated. Crafted from 100% surgical grade silicone. Durable and made to last, these new wristbands come complete with two black Power Balance holograms. Power Balance Evolution Wide Wristband features: Made with comfortable, durable 100% surgical grade silicone Wristband is completely waterproof Perforated design looks cool and enhances comfort Two holograms have cutting-edge, three-dimensional imaging Hologram design is based on Eastern philosophies related to energy Small (6.3") a Medium (7.5") a Large (8.1") Power Balance...Prepare. Perform.