Clinka-clanka, slappa-slappa! From a mile distant comes the clattering of climbers with pack-tethered helmets. Leave it to German ingenuity to engineer a stashable folding helmet: the EDELRID MADILLO ($119, edelridna.com), weighing just 13.4oz and requiring as much room (when collapsed) as a pair of rock shoes. The design is simple: flick down the rear panel, slide out the sides and snap them into place (pushing the rear panel to adjust fit), snug the chinstrap, climb. The high-impact shell, EVA foam sides (for a softer fit), eight ventilation holes, and UIAA and CE certification all equal a well-rounded, supertech dome protector newly released to the US market.