Very nicely designed!
I bought two of the Butter-Man 1/2 zips. My biggest pros: they feel awesome next to my skin, and are designed almost perfectly. I use them for hiking, and just as a base layer, even for sleeping. I like the small hidden pocket. Actually, I like the entire look and feel of the top. Another winner from MH. My only disappointment is that I wish the mock neck was about an inch higher, as my throat always seems to get cold. Alo, the fit is ru, not too snug. Love 'em!

Great for running
This is a great garment for running. It works well as a base layer (e.g., under the Patagonia Puff). It fits close to the body, so size up if you choose to wear capilene as a base layer or want a looser fit. I'm 6'1" and 180 lbs, but chose the M - providing a form fit. The thumb holes are great and functional, especially when wearing gloves and a Garmin. The pocket on the left deltoid/bicep is not as functional (cumbersome - requiring two hands) as the nearly hidden waist pocket located on the right side. It dries quickly after washing (approximately 4 hours at room temp). This will surely become one of your favorite items.

awesome comfy shirt
The butter material is sweet- really soft and stretchy, and it wicks moisture well. The thumb holes are an added plus. Great for going on long hikes.

Awesome Mountain Hardware shirt
Best shirt I've bought in a long time. It is so soft, but yet warm and looks great. You can dress it up if needed, but looks great with jeans. Enjoy.

Perfect for a fall run in Chicago!!
I went for a 5 mile run the weekend the "butter-man" came in the mail. It was a cool chicago morning around 45 degrees and it was perfect. Not to heavy and not to light. Great price and delivery was spot on, as always. Thanks Altrec!!