Love this 1/4 zip long sleeve athletic top. Very lightweight. Great layer to pack in your purse. Soft and stretchy. It’s a polyester spandex blend. I am 5’11” and 150lbs wearing a size large which fits true to size. I sized up one size for an oversized look and long sleeve. I love the length in the back, perfect to wear with leggings. Also it the fabric blocks ultraviolet rays and helps prevent sunburn. LTKOver40 LTKFitness LTKActive