I own about 15-20 of the Columbia Bonehead short sleeve shirts in a wide variety of colors. All in size 4x, 4xt, or some variation on that size.I find the size to be consistent from shirt to shirt, though I can't tell the difference between the 4x & 4xt.100% cotton along with venting makes this an extremely cooling shirt.Living year round on Sanibel Island Florida, it is hot& humid much of the year.I wear these shirts about 350 days a year in great comfort.CONS: Wish Columbia offered all the different colors at discounted prices more often.Fits good. Im a big guy and its hard to find Columbias that fit bought it in 4x for only $19.99 awesome buyLove the quality of these shirts, they are mostly cotton, so very absorbent- love the fit as well. Hard to find shirts that are broad across the chest and these are perfect.I recently bought this for a destination beach wedding. I wasn't big on the color but the shirt fit comfortably. The fabric wrinkles so you may want to iron or steam it before wearing. The flap in the back was kind of weird for me but great for the ocean breeze when you get hot.This shirt runs a bit big, but I like that.I like the flap on the back, it keeps me cool.Only style of shirt in my closet; and at $20 I wish there were more.Wonderful shirt at a very reasonable cost. My husband really loved his shirts. We ordered several colors and are very happy with the purchase.This is a great Columbia product! Only knock is if it's made in Vietnam it needs to be ironed. I have a couple of Columbia shirts made in India and they require no iron. Otherwise, and awesome product.Tan buenas que llevo 7 iguales pero de diferente color