I like the CK and 2xist but I seem to shrink them too often. What I tried and it works is going to Sports Authority and buying the UnderArmour or Russell undershirts. They are plain white, no logos, and they keep me cool all day. I also wear a dress shirt everyday. They seem to be a little more "athletic cut". Im 6'1 220lbs 33 waist. My problem with CK was the the L was a belly shirt and the XL fit me like a pillowcase.. Good luck.