I have been using this under the Delta Long Sleeve for my rides when I want to be “pack free”. The additional pockets work great for stashing some energy chews, my Ultralight Vest, or even car keys. The material wicks away sweat quickly, and best of all, I never notice it once it is on. At first I thought it might be a little too short - the front barely meets the waistband for my Trail Shorts. But, once I am on the bike, I would not want it to be any longer. For reference, I am 6’1”, 190 lbs, ,and ordered a size Large.