I know quite a bit about Sheico Neoprene as well as others.. Too often I hear about how superior Yammamoto etc.. are, and I'll call BS on it.
Every major Neoprene company out there has several grades of Rubber, several grades of different lining materials, all of which can be combined in different ways to produce different effects.
Let's talk about the Rubber Core.
Sheico has a few different Rubber Cores available. Some are geared towards Depth Diving, ie Compression Resistance, some are geared towards ultimate flexibility and lightness, and are best suited for Surface use as they will compress more easily. Sheico also has some proprietary configurations such as Airprene, which involves a perforated layer of rubber sandwiched between two non perforated layers, allowing for lots of Air Space sealed into the Rubber panel. Yammamoto has their different grades, ie 38, 39, 45.. etc.. The thing is None of these are really designed for Spearfishing.. we are a sub market.. a little fish. Basically we try to combine what is needed for the Scuba Diving Market with what is needed for the Triathalon market..
Similar to the different materials for the rubber core, their are also many different grades of lining materials offering a mix of protection, flexibility, etc..
The bottom line is that every brand of Wetsuits has their own design team who take all of this info and decide how they are going to "build" their suit ranges. They balance Price, Flexibility, Weight, Compression Resistance, durability, etc.. and come up with their product.
Yammamoto is ofcourse a good rubber, but I used a 3mm Nylon/38/Cell suit the other day and I felt like a linked sausage in that thing. It was squeezing me so tight. The next day I took out my Sheico Neoprene 3mm Ultraspan/Flexfoam/Cell suit and it was like wearing a layer of Jello on my body. It was so nice..
To answer the original question about Sheico Rubber. I'm not sure which Sheico Rubber Elios is using. But those guys make great suits and I'm sure they'll give you a straight answer. Mr. Shei, is driven to always be the best. Every time I visit his R and D center he is showing me new machines which are used to test this and that.. very scientific approach to excellence, it looks like a state of the art research lab you'd expect to find at a major research university.. which is why Sheico is the world's largest Wetsuit and Neoprene manufacturer.. they didn't get that way producing crap, and they have more resources to put towards development than any other company.