Just blew $300 on a 'quick-dry' base layer that got soaked and stayed cold for a 4-hour dive in the Gulf.

What do you guys actually use for thermal protection when the water temp drops below 50?

4 comments

4 Comments

That "quick-dry" label is such a trap for cold water, it's meant for sweat, not immersion. The real trick nobody talks about is managing the warm layer of water next to your skin. Once that flushes with cold water, you're done. I use a thick wool base layer under my wetsuit, the kind meant for hunting. It stays warm even when it's wet, which it will be.

michael_williams29d ago

Tried a 5mm merino base layer in Oregon last winter and it was a total game changer for exactly that reason.

rose_clark8119h ago

You're right about that warm water layer being key. What I've noticed is that fit is just as important as the material. A base layer that's too tight will compress the wetsuit's neoprene and actually reduce its insulation. But if it's too loose, you get those cold flushes you mentioned. I found a mid-weight wool that fits like a second skin, without squeezing, made the biggest difference for me.

abby_murphy29d ago

I get the theory, @mason531, but my old 3mm suit with just a rash guard has been fine for years in NorCal.