Hi Triton,
If you are dealing with Elios, ask them about neoprene. My newest suit is neither heiwa nor yamamoto - but something they said combines some of the best properties of both. As for thickness - I find 3 mil starts losing it's charm much below about 66f - unless you are
doing something really active. Pure freediving needs more insulation (I'm talking relatively stationary dives in the 3 minute range). I've used my 3 mil down to 45 degrees, but it makes for shortish sessions.
Heiwa is sturdy but will get stiff after about 3 years or so,
if the suit is open in and smooth out, it will start to blow out when you put it on - so you'll want to plan on a new one every 3 or 4 years.
Yamamoto is very soft and comfortable - open cell in is also very slippery - you still need lube but the suit goes on very easily. It is, however, quite compressible - so if you spend much time in cold water below 50-60 feet or so it could be a bit chilly.
For a first suit I usually recommend you get nylon out/open cell in. You can get various coatings on the open cell but they don't really do much. My first Elios suit, which is now about 8 years old, is still going strong. It's Heiwa open cell in, nylon out and is on it's second owner. My warm water suit is 3 mil with nylon IN - a first for me but I'm liking it. My cold suit is 5 mil yamamoto and feels like a layer of fat.
If you are dealing with Elios, ask them about neoprene. My newest suit is neither heiwa nor yamamoto - but something they said combines some of the best properties of both. As for thickness - I find 3 mil starts losing it's charm much below about 66f - unless you are
doing something really active. Pure freediving needs more insulation (I'm talking relatively stationary dives in the 3 minute range). I've used my 3 mil down to 45 degrees, but it makes for shortish sessions.
Heiwa is sturdy but will get stiff after about 3 years or so,
if the suit is open in and smooth out, it will start to blow out when you put it on - so you'll want to plan on a new one every 3 or 4 years.
Yamamoto is very soft and comfortable - open cell in is also very slippery - you still need lube but the suit goes on very easily. It is, however, quite compressible - so if you spend much time in cold water below 50-60 feet or so it could be a bit chilly.
For a first suit I usually recommend you get nylon out/open cell in. You can get various coatings on the open cell but they don't really do much. My first Elios suit, which is now about 8 years old, is still going strong. It's Heiwa open cell in, nylon out and is on it's second owner. My warm water suit is 3 mil with nylon IN - a first for me but I'm liking it. My cold suit is 5 mil yamamoto and feels like a layer of fat.