Since I’ve been involved with designing and marketing play apparatus, fall surfacing, climbing walls and skateparks the issue of protecting kids from falls and the use of helmets has figured prominently throughout my five decades in this field. My experience leads me to the opinion that helmets, and other protective gear should be worn when the player has the intention of testing the limits of their skill or when the environment is unpredictable.
http://playgroundguru.org/2015/02/1...ntions/?utm_source=dlvr.it&utm_medium=twitter