Murat,
I have a couple Elios suits and my best recommendation to you for what you and your buddy are going to be using the suits for is:
low-density Heiwa neoprene with gold coated open cell inside (very easy to put on without soap and yet still very warm) with elastic nylon outside. This is the configuration I just had a pair of 2 mm pants made that I used in the Nationals this past summer in Hawaii and they were awesome. For my jackets, I always get Smoothskin out. On my 3 mm it's strait open cell in/smoothskin out but for my 2 mm I went with smoothskin out/nylon in. I definitely recommend for your friend, at the very least, get elastic nylon out on the pants. Here's some info Elios sent me when I was asking them about suits for this past summer's Nationals (I believe Option #1 would be perfect for your friend, except in whatever mm he needs):
Hello,
About your request, we can offer you several solutions:
FIRST: in this low thickness, we suggest you to take jacket and pants
with nylon outside and coating inside, because without lining will be
too much delicate!
Options:
1) Suit 2mm Nylon elastic black outside / Gold coating cell inside
(include chest pad) Price Euro 170,00 It's very very elastic, warmth and
aderent to the body (easy to get into without lube)
2) Suit 2mm Nylon elastic black outside / Copper coating smooth inside
(include chest pad) Price Euro 170,00 It's very very slide for get into,
durable and hot.
3) Suit in 2mm, complete of:
Jacket smothskin outside / Nylon elastic inside (very easy to get into,
very very stretch and not so much delicated, max breathing) Panta nylon
outside / Gold coating inside (very soft, warmth and
durable)
Price Euro 152,00 (include chest pad)
4) Suit 2mm Nylon standard black outside / Titanium coating cell inside
(include chest pad) Price Euro 140,00 It's very very slide for get into,
durable and hot. (good only for shallow divings) Neoprene Ecoline
These are some of the better solutions for your needs.
If you want other informations don't hesitate to contact me.
Best regards
STEFANO
I hope this helps.
Scott