Mesh under sleeves facilitate additional airflow to keep you cool
I bought several tops recently and love them all. The inner arm mesh strip lets air in to cool me off and the prints are fabulous. I wore my Lilli Print Long Sleeve Crew Neck through a vacation in Maine and Eastern Canada and it went from hiking over rocks to a nice restaurant for dinner. It was comfortable in warm and cool weather and when washed, it dried overnight! I plan to purchase more—both long and short sleeved—for future travels.