The warmest and most breathable baselayer in the Capilene family, Capilene 4 keeps you dry and comfortable in cool-to-cold conditions. A compressible zip-neck that helps turn up the heat, it has a soft, stretchy feel, with a smooth face that glides beneath layers. Its open-grid brushed fleece interior warms your core, wicks moisture and rests smoothly against your skin. Details include articulated shoulder paneling, offset-seamed sleeves for complete shoulder mobility, hidden thumb loops to ensure wrist coverage and an elongated zipper for efficient venting. Made of 3.8-oz. Polartec Power Dry High Efficiency fabric with Polygiene permanent odor control, the fabric is bluesign approved.