Compression underwear is for sports. Worn for relatively short periods of time. It's made to get a little more out of your muscles and cut down on cramping. Under Armor has a line of loose fitting polyester underwear for all day hot weather wear. So does the Wal-Mart brand. I've tried wearing a compression T shirt all day long. It's not good. On top of the shirt mashing my belly fat all day the collar kind of grinds the dirt into my neck.