There are four seasons on Longs Peak’s shadowy Diamond-all of them cold. When the conditions say shiver, grab this lightweight yet extremely warm crew to insulate your core, manage your moisture and not weigh you down. The micro-grid fleece interior of our Capilene Thermal Weight provides the greatest warmth combined with the greatest breathability of any baselayer in our lineup. Soft, stretchy and compressible, Polartec Power Grid fabric has a smooth face that glides beneath layers and a brushed fleece interior to warm your core, wick moisture and feel smooth against your skin. This fabric also has 30-92% recycled content and is treated with Polygiene permanent odor control. Product features include a self-fabric collar with internal neck tape for chafe-free comfort, a locker loop that lets you hang it to dry, full underarm gussets for unhindered shoulder mobility, elastic thumb loops for secure hand coverage, flatlock seams that minimize chafing, offset shoulder and side seams that lie smoothly beneath pack straps, and a drop tail for additional coverage.