The Airblaster Merino Ninja Suit is as good as it gets. Serious warmth, serious functionality, and serious performance are what make the Merino Ninja Suit top tier. You may be hesitant to get a one-piece due to some certain natural processes, but fear not, Airblaster really thought that one through and equipped this piece with a 350˚ waist zip for easy #2 bathroom access. To top it all off, this midlayer features 4-way stretch and moisture wicking materials, making it a true all-around winner.