Have anybody ever seen a bicycle helmet, which is not meant for racing in some hot environment. Totally useless in cold and rain and sun. North Vietnam Army co

Have anybody ever seen a bicycle helmet, which is not meant for racing in some hot environment. Totally useless in cold and rain and sun. North Vietnam Army cork helmet seems to be quite the optimal: https://historicaviation.com/north-vietnamese-army-helmet/ https://historicaviation.com/north-vietnamese-army-helmet/