I love the quality of this t-shirt. I wear a LOT of t-shirts so have become picky and this one is excellent. I followed the sizing guide and ordered a small (I usually buy mediums). Since it is unisex sizing this turned out to be good advice; the fit is perfect. My order arrived faster than I expected too! When you factor in the important cause that is supported - our environment! - it's a win all the way around.