Very comfortable in warm, hot, cold and even rainy weather. Featuring a zippered chest pocket, this Coolmax uniform shirt is a law enforcement dream come true. I have friends in EMS who also join the Crysully tactical apparel line. Even local hospitals have field nurses who appreciate a zippered chest pocket. Add a few velcro straps in the right places and it becomes the perfect shirt for tactical uniforms. Long sleeve or short. Notice the pen holders on the sleeves of the long sleeve shirt, very handy. Just be sure to buy shorter handles for a perfect fit. Hakuna Matada, Mitchell