Material: Retro-reflective fabric (glass microbeads).
 
You won't believe your eyes but these are 2 innovative tear-proof textile stickers. These 2 flashes, 3cm in diameter each, adhere to any type of surface.
 
Repositionable a multitude of times, when the Flashes no longer stick, wash them with soapy water (or washing-up liquid), let them dry and they start sticking again.
Equip yourself with prevention devices. Perfect on each of your shoes!