This Arc'teryx women's short sleeve base layer shirt in size XL is designed for outdoor activities such as walking, hiking, and running. The shirt features a crew neckline, pullover closure, and is made of polyester liquid knit fabric that is lightweight, stretchy, and moisture-wicking. In a classic blue color, this shirt is machine washable and suitable for all seasons, offering breathability and reflective details for added visibility. The Arc'teryx Phase SL shirt is a versatile and practical choice for travel, casual wear, or as part of a workwear outfit.