I received a private email asking about the Fugu's down equivalence weight value I used in the balaclava table. The question is probably of general interest and so I will post the question and answer here.
Question: If I understand the chart you have the Fugu as 10.7 oz of fill when you match it with the Nunatak balaclava. With the total weight being 14oz isn't the fill closer to 6-7oz?
Answer: Please reference the MB UL Down Inner jacket with 15 denier fabric. The non-down components weigh 4.9 oz. Subtracting this from a Fugu medium results in ~8.4 of fill. The 850 fill versus 800 fill and the unique spaced IR barrier appears to account for the remaining 2.3 oz of 800 fill down equivalence difference.
The NB Fugu thermal tested 6.18 Iclo. Other down jackets, without 850 down and the Fugu’s unique spaced IR barrier, required 10.7 oz of 800 fill to achieve the same Iclo. I am not aware of any other down jacket (hoodless) with an Iclo that is a good equivalence for the Nunatak balaclava. I could have just said that the Nunatak was only viable for use with a quilt but that would have sounded biased.