It is a separate piece, made to the same size specs as the related insulator (UQ or TQ). I used shell material of 1.1oz ripstop on one side only (outside).
UQ IX is attached with it's own shock cord suspension. I may use velcro or snaps next time to attach to UQ.
TQ IX is attached to the TQ with snaps (velcro would be great too). It actually doesn't need to be attached at all if built right.
Use one or two layers of IX. Three would be too much, and work better as it's own unit rather than as a suplement.
I'll probably post directions on a three layer, differentially cut IX only UQ shortly - I've made that and it is rather toasty as well. Rolls up to just a hair larger than my 3oz climashield UQ, and is definitely warmer.
Paul's right on here (as is is everywhere). IX is not compressible, climashield is. This is why I prefer that they be separate units, not combined. IX alone can roll up nicely, and climashield alone can squish down nicely. Separately also gives more flexibility to the system, though there is a tiny bit of added weight doing them separately as opposed to permanently integrated - so pick your poison.
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