I have been reluctant, but coming around to the 100% polyester styles that Under Armour made very popular over the last few years. The new technology sure makes them feel thin and lightweight. We sell a TON of them out of our shop. As a small biz retail shop owner, i despise that little UA logo just about as much as the Nike swoosh. You simply pay extra for a logo and lower quality...... I am just the 'little guy' talking though. Majority of our sales are not the name brands and most (older) people like them. Better quality, equal (or lesser) cost.
Badger Sportswear is a brand that we have really been selling a lot of. They have some high quality 'Tech' sweatshirts as well. Just watch the ounce weight so you know what you are getting.
Sport-Tek is another big player in the game and has some quality stuff at excellent prices!
I urge you to check your local team sporting goods shop and tell them you want to get at least 12 or more shirts. They should let you mix/match colors if you want. The off brands are made in the same factories....... just different labels.
........of course it costs a little more than a traditional 100% cotton or 50/50 cotton/poly shirt, but i will probably offer some moisture management shirts in the clothing sale this year. Once little league baseball settles down i plan to sell some shirts. Have to see how it works out.