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I'm interested too. I'm wanting to layer under my 3mm, in order to be warmer when water temp is in 72-78F. Thanks
I assume you've already tried a 5/3 mm hooded vest, that's what I use for additional warmth. I always take it with me, regardless if I'm using my 3, 5. or 7 mm full suits. The extra 3 mm on the core and the 5 mm hood are quite warm, really cuts down on ingress of water too.
I have a long sleeve LavaCore shirt. I have worn it by itself a few times in very warm water while I was traveling, it was fine for that. I have worn it a few times under a wetsuit for extra warm, It helped but I needed an extra hood. I have thought of throwing it in my pack to wear over everything if I still got cold with what I had, but have not tried that out yet
Staying warm is a personal thing. If I was diving in water 72-78 degrees, I'd have my full 5 mm and my hooded vest. At the lower end of the range, I'd be thinking of my 7 mm. The older I get, the less tolerant of cold I've become. Getting cold is the most common cause of increased gas consumption for me.