[pct-l] Layering

[Paul Mitchell]

When moving it's about layers and wicking - a strong performing thin base
layer that wicks sweat away from your skin and a wind protection layer that
still allows the base layer to breath.  Neither of them needs to be thick.

With sleeping it's a combination of insulation from the ground, layers and
loft.  The best ground insulation probably will be layered, but specifically
layers which trap air between, or contain air, such as the obvious air pads
or closed cell foam. 

1.  A light weight sleeping bag and perhaps two silk bag liners instead of
just one.  

I'm not sure that would be the most efficient.  I think a quality down quilt
(like the ones from Nunatak) which has all the loft above and to the sides
where it's effective, and a good set of layered clothes (micro-fleece or
morino base layer, possibly a down vest) would perform best.  At roughly
4-5oz each for the silk liners I'm not sure two of them would be the best
weight to performance solution - and if the quilt/bag has good loft and your
clothes are effective, the liners may not be needed anyway.

Incidentally, for those of us who are animal-cruelty-conscious, Nunatak gets
their down from small Canadian Hutterite farms - maybe not perfect but
almost certainly better than Chinese sources.

2.  Two layers of base layer, the outer size larger than the inner layer.

That's generally the basic logic.  It's very effective.  Here's a good
article on layering: http://promountainsports.com/clothing.shtml

Cheers,
- P178