Mammut El Cap Helmet. The climbing helmet with style the El Caps stylish design leaves no excuse for not wearing a helmet when climbing. With its visor and narrow design, the El Cap creates a completely new look. In technical terms, the hybrid helmet consists of a robust outer shell combined with an innovative 2K-EPS core two styrofoam layers of different thicknesses are combined in the Conehead method to ensure maximum absorption and the highest possible safety. The many ventilation openings and perfect fit make it extremely comfortable to wear.