I also like lightweight button up shirts. 
Do you prefer long sleeve or short sleeve?
Short sleeve definitely, I like letting my arms breathe.
I like polyester short-sleeve shirts for the summer. They dry very quickly and most of the time they are breathable, though it varies. 
Polyester is a great fabric. Definitely like polyester and cotton blends as well since they feel nice.
A good 50/50 blend of polyester/cotton is the best of both world. All the benefits without the downfalls. Do you wear polos for both work and leisure? 
I wear polos at work and usually just t-shirts casually. I love polos but nothing beats the range of creative expression you get from t-shirts.
I agree. Up until the 1950s, T-shirts were considered underwear. Thanks to people like James Dean and Marlon Brando, it became socially acceptable to wear T-shirts. Now, you can wear T-shirts that bring out your personality: such as movie, band, even book t-shirts.
Exactly! Thanks to celebrities it's become mainstream to this day to have casualwear on and it's really great.
Do you wear a white t-shirt under your polo-shirt or do you just wear the polo-shirt by itself?