ESD sandals upper is made of microfiber, perforated which provides good breathability. Breathable mesh lining. Two very high-quality Velcro tapes for closure. Soft tongue and heel part. XL glass fiber toecap. Metal-free shoe. Insole - antistatic and antibacterial. Sole is protected with a light and flexible Kevlar type insert. Sole - two layers PU/PU, antistatic, resistant to oil. Sandal meets ESD requirements.