J. Gibson <<gibson.gds>>
writes:

Icaro 2000 offers a hybrid Technora/Dacron sailcloth construction.
Their Laminar model appears to have an option for a high-tech Dacron rear panel
in the sail.

Icaro's MastR and Orbiter models also have this option (I believe Icaro calls
this Dacron material 'Square' for the rip-stop pattern. I don't know the
official product name for this material).