Layer up with the lightweight, flexible and insulating warmth from the Smartwool Women's Intraknit Thermal Merino Base Layer Bottoms. This slim-fit garment integrates Merino Sport yarn, a proprietary blend of Merino wool, polyester, elastane and polyamide. Interknit, an advanced 3D knitting technology, produces an insulating and mobility-friendly fabric with knit mesh ventilation and fast-drying properties. The Interknit Thermal Marino Base Layer Bottoms also feature a mid-rise waist for added comfort. With its warmth, breathability, and movement-supporting design, this base layer is ideal for high-intensity activities in cold weather.