I just bought a pinnacle 5mm merino elastiprene and tried it out in the pool tonight. I bought it for a trip i have planned in two weeks. It was extremely comfortable. i have owned a number of suits before this one. Mostly i have used the henderson hyperstretch suits, the elastiprene suit is not as stretchy as the hyperstretch but the newer elastiprene seems as stretchy as about the hendersone thermoprene. The merino lining does make it easier to get into and out of compared to some suits. I cant wait to actually get this in the open water.