There are base layers, and then there are the women's Burton Phayse Merino Base Layer Pants. It's the lightweight merino blend yarn that sets them apart from the crowd and gives them real-world breathability and comfort credentials. Wear them riding. Wear them hiking. Wear them daily. Any which way, they have you covered with all-natural temp regulation and a soft, easygoing feel.FEATURES: Merino Single Jersey, using Rapt Yarn 87% Merino/13% Nylon (16.5 Micron) Pieced with Venting Mesh ReRAPT Yarn 49% Merino /51% Nylon. Venting Mesh Piecing Designed to maximum warmth with minimal weight for both on- and off-snow activities. Venting Mesh Piecing Chafe Free Chin Guard, Chafe-free Softlock Seams for Comfort, Designed For Ultimate Layering Performance Double Needle Stitching on Sleeves and Hem, High Merino wool content (+50%), provides excellent natural thermoregulation and odor control, Locker Loop, Maximum Warmth with Minimum Weight Next to skin Moisture Wicking Elastic at Waistband, Odor Reducing Strategic Fabric Placement for Warmth and Breathability Where you Need It, Stretch 360° For Unlimited Mobility, Superior Four-Way Stretch and Wicking Performance