Undershirts?

[KJUmp]

Originally Posted by Welpe

I wear these:

Diamond V-Neck HOTSPORT® Loose Fit Shirt - Black: Ump Attire

Bought my first two last season, great shirts...the loose fit makes them really comfortable. Order two more this week.
Also wear them under my chest protector when umpiring, they do a great job keeping me cooler on hot days.

[Judtech]

This year on a short shopping excursion at an outlet mall in IL I stumbled into a Champion store and found some 'dri fit' shirts. WOW, I have used Reebok, UA, Starter and Nike and LOVED these. Don't know what the 'name' is but they appear to be loose fitting but sort of mold to your body. EXCELLENT at wicking away sweat. Wish I would have bought more than 2! Give me an excuse to visit the alma mater next year!

EDITED: It is amazing what you can find on that new GOOGLE thing. So this is what they were. They were cheaperr at the outlet. Double Dry Vented Seamless.