"Double-hooding"

Mozi · January 31st, 2006, 08:38 PM

Honestly, I do not have the patience to try to source hoods that are GN 231 , Rubatex etc... unless the below does not cut it:

As I understand, the problem is that "normal" hoods get crushed with time. I have two good quality "normal" hoods. An Otter (looks quite heavy duty) and another Diving Concepts. In any case, what I did today is wear both. It worked quite well actually and felt quite a difference from a warmth perspective. At some point, I could change them I guess.

Any counter-indicattions to this? Anyone tried it? Good, bad or what? Or is it worth going through the "Rubatex process" ?

Thanks,

Mozi

Teppo · January 31st, 2006, 09:28 PM

Here in Finland many divers use double hoods, usually a 2-3mm hood on top of the normal, it works great just cut the face hole bigger so the mask will fit. The only problem could come is the neck reg´s tubing and that if you need to add gas to the hood (to avoid a squeeze) you have bit more work for it

Teppo

esperanza · February 1st, 2006, 09:58 AM

hi mozi,

as teppo stated above, two hoods are fairly common here up north. they will positively provide extra warmth to the head area, where the heat loss is greatest. double hoods pose only one significant risk, and that is if they fit too tight (as teppo also mentioned), as equalizing the hood may be difficult.

i got first hand experience of this three weeks ago as i managed to blow out my left eardrum during a dive... so if you choose to use two hoods, make sure that you're able to equalize the hood via the mask.

regards,

- e

K Ripley · February 1st, 2006, 01:36 PM

Anyone tried using a larger second hood to help avoid the squeeze, or does that allow too much water flow between the hoods, thereby defeating the purpose?Kevin

LauNar · February 1st, 2006, 02:18 PM

You should also note that most of the drysuits in Finland have an attached hood, and you would put the second hood on top of that. I don't know if the equalization problem is as bad with two separate hoods where the water can move move freely. An attached wet hood is nice - because the water can only get in through the face opening, they may stay quite dry if the fit happens to be good. Less water migration -> warmer. The hood in my suit is still dry most of the time even after ~150 dives on it. That said, I'm going to install a dry hood this month to get rid of the neck seal.

We should do like mom told us - keep our head, feet and hands warm. Sporting a 400 gram type B thinsulate suit with thin separate wet hood and wet gloves is just not optimal (engineer word for plain silly) - you lose most of your heat through neck and head circulation. Someone should tell that to GI too.

--
Lauri

esperanza · February 1st, 2006, 02:19 PM

Quote: (Originally Posted by K Ripley)

Anyone tried using a larger second hood to help avoid the squeeze, or does that allow too much water flow between the hoods, thereby defeating the purpose?

the outer hood must be a bit larger, but the fit should still be fairly snug... i don't think you get any isolation benefit of a second hood if the size difference is too large, ie. you find fish swimming between the two hoods =) i know i need to replace my hood with a larger one. then again, it's not too urgent, as i've still got three weeks to go until i can dive again. damn.

- e

Mozi · February 1st, 2006, 02:29 PM

Quote: (Originally Posted by esperanza)

the outer hood must be a bit larger, but the fit should still be fairly snug... i don't think you get any isolation benefit of a second hood if the size difference is too large, ie. you find fish swimming between the two hoods =) i know i need to replace my hood with a larger one. then again, it's not too urgent, as i've still got three weeks to go until i can dive again. damn.

- e

The outer hood I tried as the "second hood" was barely larger so the whole thing was pretty snug and water was static. I thin both would amount to 10mm. No equalization problems.

Mozi

GoDiva · February 1st, 2006, 11:56 PM

Last spring I started wearing a bathing cap under my hood. The first time because I thought it might be warmer, but afterwards because it kept my hair out of my face and stopped it being to tangled. Afraid I can not really say if it was warmer or not

. Even in the tropics I wear a bathing cap (ok, not rule no. 6, but it feels better for me

)

Rick · February 2nd, 2006, 10:44 AM

Both Chris & Danny used double hoods down in France...IIRC they were 3mm Exel Infiniti type hoods on top of the warm neck DUI.

HTH

oymehus · February 2nd, 2006, 11:30 AM

Quote: (Originally Posted by Rick)

Both Chris & Danny used double hoods down in France...IIRC they were 3mm Exel Infiniti type hoods on top of the warm neck DUI.
HTH

He, he.. 'warm DUI hood' is an oxymoron :D That hood is positively the coldest one I've ever used.

Øystein

January 31st, 2006, 08:38 PM	#1 (permalink)
Mozi(Offline) New Member Join Date: Jan 2006 Location: Beirut, Lebanon Posts: 80	"Double-hooding" Honestly, I do not have the patience to try to source hoods that are GN 231 , Rubatex etc... unless the below does not cut it: As I understand, the problem is that "normal" hoods get crushed with time. I have two good quality "normal" hoods. An Otter (looks quite heavy duty) and another Diving Concepts. In any case, what I did today is wear both. It worked quite well actually and felt quite a difference from a warmth perspective. At some point, I could change them I guess. Any counter-indicattions to this? Anyone tried it? Good, bad or what? Or is it worth going through the "Rubatex process" ? Thanks, Mozi

January 31st, 2006, 09:28 PM	#2 (permalink)
Teppo(Offline) New Member Join Date: Nov 2005 Location: Helsinki, Finland Posts: 118	Here in Finland many divers use double hoods, usually a 2-3mm hood on top of the normal, it works great just cut the face hole bigger so the mask will fit. The only problem could come is the neck reg´s tubing and that if you need to add gas to the hood (to avoid a squeeze) you have bit more work for it Teppo __________________ Teppo http://koti.welho.com/tlallukk/

February 1st, 2006, 09:58 AM	#3 (permalink)
esperanza(Offline) New Member Join Date: Nov 2005 Location: helsinki, finland Posts: 32	potential dangers of two hoods hi mozi, as teppo stated above, two hoods are fairly common here up north. they will positively provide extra warmth to the head area, where the heat loss is greatest. double hoods pose only one significant risk, and that is if they fit too tight (as teppo also mentioned), as equalizing the hood may be difficult. i got first hand experience of this three weeks ago as i managed to blow out my left eardrum during a dive... so if you choose to use two hoods, make sure that you're able to equalize the hood via the mask. regards, - e Last edited by esperanza; February 1st, 2006 at 02:13 PM. Reason: typos

February 2nd, 2006, 10:44 AM	#9 (permalink)
Rick(Offline) Jock Exley Join Date: Nov 2005 Location: Falkirk/Stratford UK Posts: 730	Both Chris & Danny used double hoods down in France...IIRC they were 3mm Exel Infiniti type hoods on top of the warm neck DUI. HTH __________________ Forget Everything And Remember http://phreaticzone.thedeepstop.com/ http://www.dublinbaydiving.com/

February 1st, 2006, 01:36 PM	#4 (permalink)
K Ripley(Offline) New Member Join Date: Dec 2005 Location: Ottawa, Ontario, Canada Posts: 43	Anyone tried using a larger second hood to help avoid the squeeze, or does that allow too much water flow between the hoods, thereby defeating the purpose?Kevin

February 1st, 2006, 02:18 PM	#5 (permalink)
LauNar(Offline) ... Join Date: Nov 2005 Location: Finland Posts: 131	You should also note that most of the drysuits in Finland have an attached hood, and you would put the second hood on top of that. I don't know if the equalization problem is as bad with two separate hoods where the water can move move freely. An attached wet hood is nice - because the water can only get in through the face opening, they may stay quite dry if the fit happens to be good. Less water migration -> warmer. The hood in my suit is still dry most of the time even after ~150 dives on it. That said, I'm going to install a dry hood this month to get rid of the neck seal. We should do like mom told us - keep our head, feet and hands warm. Sporting a 400 gram type B thinsulate suit with thin separate wet hood and wet gloves is just not optimal (engineer word for plain silly) - you lose most of your heat through neck and head circulation. Someone should tell that to GI too. -- Lauri

February 1st, 2006, 02:19 PM	#6 (permalink)
esperanza(Offline) New Member Join Date: Nov 2005 Location: helsinki, finland Posts: 32	Quote: (Originally Posted by K Ripley) Anyone tried using a larger second hood to help avoid the squeeze, or does that allow too much water flow between the hoods, thereby defeating the purpose? the outer hood must be a bit larger, but the fit should still be fairly snug... i don't think you get any isolation benefit of a second hood if the size difference is too large, ie. you find fish swimming between the two hoods =) i know i need to replace my hood with a larger one. then again, it's not too urgent, as i've still got three weeks to go until i can dive again. damn. - e

February 1st, 2006, 02:29 PM	#7 (permalink)
Mozi(Offline) New Member Join Date: Jan 2006 Location: Beirut, Lebanon Posts: 80	Quote: (Originally Posted by esperanza) the outer hood must be a bit larger, but the fit should still be fairly snug... i don't think you get any isolation benefit of a second hood if the size difference is too large, ie. you find fish swimming between the two hoods =) i know i need to replace my hood with a larger one. then again, it's not too urgent, as i've still got three weeks to go until i can dive again. damn. - e The outer hood I tried as the "second hood" was barely larger so the whole thing was pretty snug and water was static. I thin both would amount to 10mm. No equalization problems. Mozi

February 1st, 2006, 11:56 PM	#8 (permalink)
GoDiva(Offline) New Member Join Date: Dec 2005 Location: Belgium Posts: 560	Last spring I started wearing a bathing cap under my hood. The first time because I thought it might be warmer, but afterwards because it kept my hair out of my face and stopped it being to tangled. Afraid I can not really say if it was warmer or not . Even in the tropics I wear a bathing cap (ok, not rule no. 6, but it feels better for me )

February 2nd, 2006, 11:30 AM	#10 (permalink)
oymehus(Offline) New Member Join Date: Feb 2006 Location: Stavanger, Norway Posts: 16	Quote: (Originally Posted by Rick) Both Chris & Danny used double hoods down in France...IIRC they were 3mm Exel Infiniti type hoods on top of the warm neck DUI. HTH He, he.. 'warm DUI hood' is an oxymoron :D That hood is positively the coldest one I've ever used. Øystein