There are many reasons to replace several of your favorite tee shirts with the tech lite short sleeve crewe when you pack for an adventure the first is comfort for this season we39ve used a nylon core wrapped in merino wool construction to enhance the durability and longevity of your tech lite tee why icebreaker merino the merino is an ancient breed of alpine sheep over millions of years they evolved a superfine highly breathable fleece to protect them from freezing winters and scorchi