Mens Intraknit All-season Merino Base Layer Crew TopOne of the best parts of Smartwool base layers is that they help reduce some of the uncomfortable distractions intense activity can produce. This crew top features our Intraknit technologywhere insulation, articulation, and ventilation are seamlessly integrated to help enhance movement and comfort. The fabric helps combine the moisture management, temperature regulation, and odor resistance of Merino with TENCEL Lyocell fiber to help keep you cool.