Honour to Aeros to revive the zipper concept.
I had two zipper kites around 2000 for about 2 years in use:
Both Windtools Mosquito Prototypes
- 9+ zipping down to about 7,8 m²
- 5 m² zipping down to about 4,2 m²
Difference was not as big as for the Aeros S1 Duo, but as in 2000 the zipper was the only "depower" it was quite valuable and I was zipping on and off about 2 times every land board session for those 2 years and always missed the option till now.