Scuba Diving/layering wetsuits

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Question
Hi Mike,

I have a 6.5mm wetsuit and dive in cold water. I'm not looking at dry-suits but I know several people who use a combination of a 3mm shorty wetsuit and a steamer. My question is: is it better to have the shorty underneath or on top of the steamer for warmth?
For maneuverability having the shorty on top seems to be the go but keeping your core warm by having it underneath seems to be logical.
Your thoughts please?

Answer
Hi Bruce,

I have to confess to not knowing what a "steamer" is.  I'm going to assume that it's a thinner, and possibly fleece lined, full wetsuit.  If that's the case then I'd definitely wear the shorty over the steamer.  

First, it will be much more comfortable that way.

Secondly, as you know, a wetsuit works by trapping a very thin layer of water between your skin and the wetsuit.  Once this water is warmed by your body, it's critical to keep it from moving around and possibly escaping...only to be replaced by cooler water from the surrounding sea.  Wearing the steamer under the shorty prevents water migration in two ways.  First, it provides a continuous layer of fabric right next to your skin and, while some of the fabric may be compressed somewhat by the shorty, it will still keep warmed water from migrating around.  Secondly, and in the same thought process, if you wore the shorty under the steamer then you've got a small gap where the steamer fabric rides over the shorty at the sleeve ends,cuffs and zipper.  These channels will allow water to move more easily and defeat the purpose of the wetsuit.

Bruce, I hope this provides the information you need to keep warm and make the best use of your exposure suits.  I apologize for not knowing just what a steamer is but I hope my guess was close enough to answer your question.

Thanks for writing and I wish you warm diving!!

Mike
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Mike Giles

Expertise

I am a Master Scuba Instructor with over 6000 dives. I can answer questions on general diving techniques, diving education and diver training. I can offer suggestions on the use and selection of proper dive equipment, general maintenance of dive equipment as well as diving equipment repair. I can also offer suggestions on air conservation techniques and buoyancy control. As a dive shop owner for 19 years, I can offer suggestions on starting/running a dive business.

Experience

I have been diving for 55 years, teaching diving for 50 years and owned a diving business for 19 years. I am a certified regulator repair technician for several different brands and a certified scuba cylinder inspector.

Organizations
I am currently a member of the Professional Association of Diving Instructors (PADI), Divers Alert Network (DAN), International Resort and Retailer Association and the Better Business Bureau

Publications
Undercurrent magazine and Divers Chapbook

Education/Credentials
I am a Master Scuba Diver Trainer with 15 distinct specialty instructor ratings, Rescue Diver Instructor, Medic-First Aid Instructor and I have degrees in Chemical Engineering, Biology and Radiologic Technology.

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