I thought it was just my subconscious preference but I've also told my wife that those two shirts are the most comfortable ones I own. I have the Red Team on right now, matter of fact. Tag says they are 50% polyester, 25% cotton, and 25% rayon. That's not the whole story though because they have a way better feel than my work shirts, which are made of similar materials. Pretty durable too. They've stood repeated washings.
BTW, I did contact Epic and ask if green and yellow teams will be made. Answer: No