My gawd, don't people ever learn? Have any of them ever heard of Skully, or any of the other crowd funding products that took their money and just faded away? Does the phrase "Too Good to be True" ring a bell? https://www.engadget.com/2018/11/28/jarvish-smart-motorbike-helmets-kickstarter-discount/
Check out Nuviz, addon HUD. On sale now at Revzilla $524. Anyone who markets complete helmet is nuts, with all the size variations, colors etc, What happens when it is in an accident? You are suppose to replace it.