This is no pre-flight equipment check it s a hockey player s helmet check list. A well fitted helmet, properly fastened is the safest head protection. Loose is not going to do the job. The hard hat in the work force must withstand the impact of falling objects. The weight of these objects increase on impact as they descend.
Workers take hard hats for granted till they're hit on the head by a falling wrench.
The force of two bodies of equal weight, around 175 pounds each, moving at on ice speeds of 30 miles an hour, colliding head first into an immovable ungiving barrier chalks up to a mighty heavy wrench. Every time a helmet manufacturer comes up with a new design, it must be re-certified. A certification is equivalent to a Consumer Product Safety seal of approval. Helmets aren't marketable without certifications. Remember warning labels make no claims to keeping you injury free.