The Womens Smartwool Microweight Crew is comfortable enough to wear alone or as a second layer. Made of 100% merino wool, the Microweight Crew offers supreme moisture control combined with a natural stretch, making it soft and durable. This Smartwool crew was designed with a crew neckline and flatlock seam construction to reduce unwanted chafing. Providing UPF 30 protection, the Microweight Crew guards your top from harmful UV rays when you're outside. With improved fit and princess seams, this crew is every bit as flattering as it is comfortable. The Womens Smartwool Microweight Crew should be a staple item in your closet that keeps you comfortable all year round.