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I guess those of us who (still) use Viking suits, and have gotten used to
breathing out our noses to inflate the dryhood, will have some re-training to
do when using rebreathers.

FYI, I sent a post last year asking if it was practical to use a dryhood with
trimix. Dryhoods are inflated with breathing gas, and in theory the helium
should increase heat loss through the dryhood.  Having done about a dozen
cold (40-60F) water dives on mix this year, I have found the answer. 
Although your head is noticibly colder in a dryhood when breathing gas than
when breathing air, it still feels warmer to me than a wethood.

John
HeimannJ@ma*.nd*.gt*.co*

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