The special construction of Duette makes it the best insulating window blind available, because of their insulating air-filled structure, Duette Shades are a particlarly appropriate choice for the loft, conservatory or single-glazed windows a effective barrier between the heat or cold of the day.
Lots of other options 'top down-bottom up' allowing you to raise or lower both ends of the blind, and a '2 in 1 option - combining two different fabrics in one blind.

A honeycomb of versalility

 Duette 2009 Retail Brochure