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The Slogan. The Squid. The Swag. If we need to explain this slogan to you, you ain't about this life.
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 Small
If you are between 5'5'-5'10 (and/or a small or medium build) get Medium
If you are between 5'7-5'11 (and/or a medium+ build) get Large
If you are between 5'9-6'1 (and/or have quite a lot of muscle) get X-Large
If you are 6'0+ (until maximum height 6'5) get XXL
Women 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.