This undershirt excels at moisture absorption and quick drying. Omni-Wick technology rapidly absorbs and disperses sweat, ensuring a comfortable feel even when you perspire, supporting your activities. Its high stretchability provides a comfortable fit with your movements. It also boasts excellent UV protection. The use of odor-eliminating sewing thread cuts down on sweat odors, making it ideal for long periods of activity. Material: Stretch Jersey (90% Polyester, 10% Polyurethane) I only wore this once during a climb of Mt. Fuji. I'd like to pass it on to someone who can use it.