▪ Made of acrylic, merino wool, polyester, nylon, rubber and spandex ▪ 360° arch and Achilles tendon support ▪ Outer side pocket for the battery storage with YKK zipper ▪ 3 heat settings controlled with mobile application or directly with the batteries ▪ 2 lithium polymer batteries included ▪ USB charging cord and wall adapter included ▪ Heating zone under the foot