The revolutionary Edelrid Madillo climbing helmet provides unmatched packability to make stowing this essential piece of gear incredibly simple. Features:- Sides of helmet retract while the back folds inward, reducing the pack volume up to 50% Expanded polypropylene (EPP) foam is positioned in the upper half of the shell for excellent shock absorption Soft EVA foam is used on the sides of the helmet for a comfortable fit Rear panel partially covers the neck to provide protection when you&';re looking looking downward Simple size adjustment is achieved by pushing the rear panel while the helmet is on; helmet adjusts from 52 - 62cm Exterior clips secure a headlamp in place