There are many reasons to replace several of your favorite tee shirts with the men's Tech Lite Short Sleeve Crew Graphic when you pack for an adventure. The first is comfort. Made from 150 gm merino jersey, with a touch of LYCRA, it feels very soft against your skin, breathes well in warm weather and keeps you warm when it's cool. For this season, Icebreaker also added a Nylon core wrapped in merino wool to enhance durability and longevity of your tech lite tee. And because it's merino, you can wear it several times between washing.