original OEM Smart Forfour 453 Boot tub , Shallow 

Allows transportation of wet and/or dirty objects (e.g. hiking boots, inline skates, tools,…).
Protects the luggage compartment carpet from dirt.
Non-slip surface and raised edges prevent objects from slipping and stop dirt and liquids from entering the passenger compartment.
Affixed with Velcro; can be removed and cleaned at any time.