Under Armour Performance Stretch Underwear combines high-stretch comfort with easy care for everyday wear. The polyester-elastane blend delivers flexible support suited to warmer seasons and active days. Key attributes: Black | Polyester | Stretch fabric | All-day comfort | Suitable for spring/summer | Machine washable at 30° | Easy care | Composition & care: 98% polyester | 2% elastane | Machine wash at 30°.