Mammut El Cap Kids. The stylish El Cap Kids leaves budding climbing professionals no excuse for not wearing a helmet when climbing. With its visor and narrow construction, the El Cap Kids 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.