You expect your base layer to assist in keeping you warm and wicking away moisture so you stay dry. Yet, at the same time, it needs to be both light enough and shape-retaining, so that it doesn???t stretch out. Welcome to the world of the Equinox Stretch Tight - part of the EMS Ascent Series. 90% polyester/10% spandex. Moisture-wicking and breathable construction. Abrasion resistant. Gives you a greater range of motion. With an elastic waistband, cuffs, and drawstring closure. Machine wash. Imported. 2454090033505 34269100019 F19M1405