I bought this shirt for a planned trip to the galapogas. Since we will be on the equator, I needed something that would protect me from the sun while snorkeling and give me some protection from possible stinging critters in the water. I also wanted something that would pack light and dry quickly.this Coolibar long-sleeve shirt looked to fit the bill. When I got it home I tried it on (perfect fit, size small, with room to move) I am 5'6" and 130lbs. But it still had to go through the swim trial. I live in Florida so am able to swim every day. Into the pool I went fully expecting this shirt to ride up around my chest or have the sleeves flop around. Not so! This shirt stayed down where it was supposed to, kept the sun off my back and arms and thwarted off the cool water of the pool. I immediately got out my catalog and ordered another shirt with the capris bottoms and the capris bottoms with the attached skirt. Really cute. All great fit, all dried quickly. I ordered small in everything. I plan to wear the shirts when we go on the islands since it will be great sun protection and very light weight. I really love these Coolibar clothes. The only concern I had is that these swim shirts do not have built in bras. I plan to wear a sports bra underneath when swimming since we know what happens when we get out of the water. At age 65, I do not need to go there! These swim suits are somewhat pricy but I am justifying it by getting double duty out of them, on land and water. If you are looking for something that protects you from the sun, covers you, yet is cool and looks great his is for you!