3rd and 4th ones of these I have purchased. Comfortable, supportive, and reasonably warm down to about 5C (need something over them for cooler). They also seem to be pretty good for long use (no problem with seams breaking or fabric excessively wearing).

This long sleeve compression top is top for all weather: Worn in Death Valley at 117 degrees, the next day in the 50s to 70s to 12,000 feet. The shirt functions to prevent sunburn at highest elevations, and to cool at highest temperatures and to reduce solar heating because close skin contact evaporates perspiration which cools skin.

Compression clothing always produces a healthy sensation and improved circulation. 2xu provides the highest quality fabric and fabrication. The shirt often gets positive comments.