Here's what other sites are saying:
The men's Craft PXC Thermal half-zip top can be easily layered beneath a shell or used on its own in mild winter conditions. It supplies great movement and moisture wicking performance. Soft and stretchy polyester/spandex blended fabric ensures freedom of movement; brushed inner face maximizes moisture dispersal and helps with thermal regulation. Half-zip neck lets you warm up or cool down as conditions demand; shaped collar offers nonrestrictive comfort. Ergonomically placed seams are designed to allow smooth, nonrestrictive movement and reduce friction zones. Back hem is dropped slightly for full coverage; silicon grip strip ensures hem stays in place. Small zippered chest pocket and 2 back mesh pockets work great for organizing small essentials.
- REI refers to the men's version