"Safe One" is a smart and unique designed "lock ball" for a bicycle helmet. The lock simply stays at the bike - and whenever you park the bike and take of your helmet - the bicycle helmet are to be stored in the bag which you pull out of the ball. Place the helmet in the bag - place the straps from the helmet around the locking system - and the helmet is now safe protected from theft (because the straps must be cut to get the helmet out of the bag) + the helmet is safe protected from rain, dust etc.