Here's what other sites are saying:
If overachieving NASA engineers moonlighted as performance clothing designers, they still would've been hard-pressed to devise all the features of the X-Bionic Women's Energy Accumulator Extra Warm Long-Sleeve Shirt. X-Bionic incorporates an intricate system of channels, air pockets, and moisture-wicking canals into the shirt's fibers to regulate your skin's moisture and temperature with excellent precision. Excess heat and moisture escape easily, while the shirt's stay-dry system ensures that you never feel clammy. X-Bionic even incorporated ribbing at the elbow joints so you can bend without stretching the shirt's fibers to the point that their performance is compromised. Now, that's attention to detail. Wear as a super-dry base layer during snow sports, or alone for cool-weather aerobic activity.