I found out about Mysterioso M-Tech from a surfer friend of mind and he said that it is very popular on the west coast and he wears it under his wetsuit to give him, what he feels is equivalent to another 1.5 millimeter of wetsuit warmth. He also says when the water is not that cold and he doesn't use the wetsuit, he will use the Mysterioso M-Tech alone. I decided to purchase a top and try it while surfing; I was a believer, not only did it make me feel less clammy inside my wetsuit; it gave me that extra warmth that he told me about.
I was still not sure the Mysterioso would perform in the kayaking environment but I quickly found out because of its lightweight, breathability, and quick drying it was a must to have on the water. The amount of warmth in relation to its bulk is fantastic, I will always take a full set (pants and top) with me, even in warmer months just to have it along. It will compress into the smallest dry bag and I can throw it on if I get chilly. It is perfect for under dry wear because of the limited bulk.
The fabric is a combination of nylon, polyester and spandex. This combination makes it very wind resistant - even soaking wet- yet is breathable! The company promotes it as being odor resistant and I must say it truly is. I have used it on a trip for 7 days straight and did not notice any odor on the garment.
Sizing can be tricky as it is designed to be worn slightly tighter so it's closer to the skin but some people choose to go a little looser with it for extra comfort.
Mysterioso is made right here in the U.S of A, the quality is awesome. I still have my original top that I purchased 6 years ago and it still looks great and it has got plenty of use from skiing, surfing, kayaking, fishing and everyday use. Mysterioso is not cheap but the use you will get out of the years to come makes it a great value. We have sold it for years now and the feedback we have received has been overwhelmingly positive.