Nat-2 STACK 4 in 1 E.C.O.
This model is equipped with a patented system, converting a slipper to a low- or mid-cut style as well as a boot. Every pair comes as complete set. Owning two pairs of the same size, makes it possible to combine and interchange all parts and to create unique creations.
The first collection (2008) had 8 styles in basic colours. They already give you the option to do up to 760 different colour/material/part combinations. The number will rise season by season.