MAMMUT Wall Rider Mammut Helmet Trekking Climbing □ Item Details 【Size】56-61cm 【Condition Details】Used (Many small scratches, but no critical damage) Top-class ultra-lightweight climbing helmet. Lightweight design achieved through the use of an EPP (expanded polypropylene) shell and a minimal adjustment system. In addition to the high cushioning properties of EPP plastic, a durable hard shell is used for the helmet shell to maximize safety.