PRE-SALE (STARTS SHIPPING WITHIN 2 WEEKS) Apparently lifting is supposed to make you feel awesome, improve your self image and build muscle. No one told you that you would never be satisfied, always feeling beat up and silently wishing Creatine was more effective.We exist in our own little pain prisms, we lifters. Some cry out “No Pain, No Gain!” But secretly we know it’s All Pain and No GAIN.   Keep in mind the MAJOR difference in sizing is just the length (most tank sizes in the chest area fit pretty similar). At 5'10 and 180lb, I wear a size Large. I would say the following sizes would work as a rule.If you are below 5'4 (or female) get SmallIf you are between 5'5'-5'10 (and/or a small or medium build) get MediumIf you are between 5'7-5'11 (and/or a medium+ build) get LargeIf you are between 5'9-6'1 (and/or have quite a lot of muscle) get X-LargeIf you are 6'0+ (until maximum height 6'5) get XXLWomen should wear the S or M. Most guys are either M or L (or if you are jacked/are taller, XL). Personally I like to wear the L or XL (whereas for t-shirts I usually wear a M or for leg day a L).Made of 88% Polyester, 8% Raylon, 4% Spandex. Machine wash on cold.