dont know if this will help anyone but I emailed eliossub a while back asking about their different suits, and this is what they wrote back. There is nothing about heiwa material, but I'm sure they'll answer anyone who asks them about it. All these prices are for custom suits. I asked for a 3mm high waist suit (which is abot 13 euros cheaper than all that is reported below, which describe long johns), which is why they only report that thinkness in the reply. I settled for skin out, superelastic inside, and the suit should arrive any day now.
"1) 3mm (Samdwich) smoothskin outside / nylon in the middle / open cell
inside Price Euro 214,00 (available also in smoothskin outside / nylon
in the middle / smoothskin inside) It's very warm, aderent to the body
and resistent against tears but little less soft than other materials,
And for get into must use talco or watersoap
2) 3mm smoothskin outside / open cell inside Price 172,00
It's ultra soft, very warm and aderent but also very very delicated And
for get into must use talco or watersoap.
3) 3mm smoothskin outside / superelastic lining inside Price Euro 214,00
It's very very elastic and easy to wear, resistent and confortable (more
used from Swenden freedivers)
4) 3mm smoothskin outside / gold coating inside Price Euro 214,00 It's
ultra soft, slide to get into, very warm but also more delicated against
tears.
5) 3mm smoothskin outside / thermic plush inside Price Euro 198,00 It's
soft, easy to wear, warm and resistent.
6) 3,5mm smoothskin outside / nylon elastic inside Price Euro 172,00
It's easy to wear, soft and confortable"
Hope this helps any curious divers.
Erik