DESIGN AND CONSTRUCTION
The whole point of high quality down is to provide warmth
for the least weight (otherwise you might as well use feathers - much
cheaper and just as warm if you put enough in). To maximize the effectiveness
of the finest fill requires good design. Down, with the highest fill
power in the world, will not provide the best weight/warmth package
if the shell uses inferior materials or poor construction. And such
is the price of the best downs that they are an expensive folly unless
matched by design and craftsmanship of an equally high order.