When you are on the go an under shirt that can keep you cool and dry overnight is just the type of clothing you need. The Exofficio Give-N-Bo 2.0 crew neck Tee has been a standard for world travelers and backcountry travelers. Exofficio has improved this Tee with the 2.0. Now the Exofficio Give-N-Go Tees has up to 4 times more breathable, 50% more moisture-wicking, and 25% more quick-drying compared to our original.89% Nylon / 11% ElastaneBreathable mesh fabric supplies airflow to keep you cool, Durable synthetic fabricFlatlock seams reduce chafingImproved anti-odor treatment stays fresher, longerEasy-care so you only need two for any trip