The metal-free design ensures no problems during security checks. The upper is made from a combination of microfibre and textile. The lining features Gore-Tex Extended, a 3-layer Gore-Tex laminate that is waterproof and highly breathable. The abrasion-resistant lining offers maximum climate comfort and is suitable for both flexible indoor and outdoor use, especially in warmer temperatures. The insole is comfortable, cushioning, moisture-wicking and antibacterial. It contains a separate heel cup for good cushioning and foot support as well as "Airflow" channels. The "Perfect-Fit" labelling makes it easy to check the correct shoe size. The non-slip properties offer very good grip on various surfaces thanks to the tread design and the special rubber used. The puncture-resistant sole is flexible, lightweight, metal-free and has a puncture-resistant insole. The sole is constructed with a modern, lightweight sports shoe design made from rubber and PU.