Overall I love this. Breathable, good length on body and arms. Perfect for when it's chilly out but you know you're gonna be sweating once you start.
Key point on sizing though. I got these because I'd fallen in love with the UA Tech Twist t-shirts (short and long sleeved, V-neck and crew). This 1/2 Zip XL fit me like a UA Tech Twist tshirt sized Large. These are definitely a more fitted design. However, i was surprised to find that it wasn't constricting, and actually didn't look bad on me. The design keeps the material closer to your body and aids in moisture wicking, and maneuverability without chafing.

Size up if you want this item to fit you like the UA Tech Twist tshirts. Your normal size will not fit the same in this design. However, if you're willing to experiment with something different (i usually prefer baggier clothes), get your normal size and you may be surprised at how comfortably you move in this shirt.
Pictures are both XL, to show the size difference between designs. Apologies for poor quality, i don't know how to touch up photos.

This top is great for a light weight long sleeve work out top. It is a bit see through. It It is very form fitting and flattering. I love it!

Would love a bronze/gold/yellow?ish color for Fall, just love this half zip, keep them coming!!!

Great top for summer months when you want to stay covered from the sun and still be cool. Fabric is super light weight and cool. Great for running even on hot days.
Do recommend applying sunscreen still though if you are going to be staying under the sun for extended periods.

I bought this because I needed to cover my arms. It keeps you as cool as possible in the heat. This top is much easier than trying to remember to reapply sunscreen.

I love all of these UA zip 1/2 and 3/4 tops.I only wear open tops and can't stand turtle necks or any covered up tops in the front. The ZIPPER in front most practical. I have all various colours. Yes they are longer fit and I take them to my seamstress to shorten them. They are my wardrobe now .....They are so worth .... I am always looking for more and exciting colours! UA keep them coming!!!!

Love this top. Comfortable nice color fits a little snug so size up if you want it to be loose

I bought this quarter zip for work. It has been a perfect top to wear with my scrubs. Light weight and very comfortable! The only thing that is missing are pockets. The fit is perfect and I?ve received several compliments on my top.

This shirt was perfect for running. It was thin and great coverage. The shirt kept me warm during the cold mornings.

I got this for my lady for her birthday. It all started with the shoes that are the same color, then the leggings and the pullover she loved it all!!