The large size and detailed design of the chest pockets (6"wide X 7&3/4" high) was my main motivation to cough up the money for these shirts.  The pockets have bellows on the bottom and sides, a pleat in the middle and a flap on top....Serious pockets for holding bulky items which are not too heavy.  Moreover, the pockets are placed a bit low to allow easier access.  One criticism:--I feel that one velcro closure in the middle of each flap is not adequate and should be replaced with two...one at the end of each flap. The 'secret' pocket on the right is flat with a zipper on top.

I love the versatility of having the option of short or long sleeves made possible by the flap and button on each sleeve. The sleeves are full and do not bind when rolled up.  The ventilation areas are effective and unobtrusive.  I wear shirts like these all year around as a base layer; Adding layers over it when need be.

These shirts are very lightweight but due to the nylon-polyester blend, they should be several times more abrasion and tear resistant (but less heat resistant) than cotton.  The shirts are easy to hand wash and due to the type of  material, dry quickly.  Another detail I find useful in the gym and at night is the hang loop in the back

The quality control of these Airstrip shirts appears to be at a high level.  I bought one at first as a test.  All the proportions were right and the sewing was tight with small stitches.  I then purchase four more in different colors and they all conformed to the same high standard.  I plan to buy more in the future.