Amazing as with ANY UA product! This shirt is long enough to comfortably stay tucked in while under my vest. It's as comfortable as a second skin but cool as if it werent there. The compression aspect does help support and give relief to your muscles. I bought 3 as apparently that was the limit when they were on sale for $9.98 at the time. WELL WORTH IT! Sleeveless under a duty sirt is the best, and this product DELIVERES. I have had all three in rotation for about 4 months, and so far no signs of degradation. They STILL look the same as the day they arrived!
UPDATE: Purchased April 10, 2017 for $9.98, limited to 3 to purchase. Today December 16, 2017 after 8 months of wear, they STILL fit great, havent worn or lost it's compression.