bike helmet modified ILM Full Face Dual Visor Motorcycle Helmets with Rear Wing Pinlock Compatible Motorbike Street DOT Men Women Model 861A (TheNight, M) : Automotive los angeles bike shop X-Treme 300W 24V X-Cursion Color:Tan/Black namely some custom helmets

bike helmet modified ILM Full Face Dual Visor Motorcycle Helmets with Rear Wing Pinlock Compatible Motorbike Street DOT Men Women Model 861A (TheNight, M) : Automotive los angeles bike shop X-Treme 300W 24V X-Cursion Color:Tan/Black namely some custom helmets

X-Treme 300W 24V X-Cursion Elite Folding Mountain Electric Bike - Metallic Red

The legal stuff Per Oregon Revised Statute (ORS) 814.485 anyone under 16 is required to wear a helmet on a bike

los angeles bike shop

Color:Tan/Black

I think a helmet on concrete is more likely to benefit from MIPS as the concrete doesn't move and will "grab" the helmet where as dirt reduces the friction

namely some custom helmets that I made