overade's smart helmet light detects braking intention to ensure bike safety
North America Cycles offers Overade Plixi folding helmet
Amazon.com : Foldable helmet Plixi Fit - for bike, kick scooter, skateboard, overboard, e-bike - CPSC standard, same protection as classic helmet - Volume divided by 3 when folded (Black, L/XL) :
Overade
Overade | Foldable Bike Helmet
Review: Overade Plixi Folding Helmet | road.cc
PLIXI FIT foldable bicycle helmet for the city and urban environments