Agree with those in the runs large camp. Fits like a potato sack with a hole in the top, very boxy.

I'm not sure why others had a problem with sizing, mine fits perfect. As soon as I got it, I tried it on, wife approved, so I washed it and wore it to work. The only thing I don't like is the limited motion. I have grown very accustomed to clothing that moves with me and has a bit of stretch. This shirt does not. It looks great though, so I will keep it. I have a slender build, and this will be a great shirt to wear in almost any setting. I do have my CCW permit and the waist area provides a touch a bagginess to aid in concealment. I paired it with Prana Zion pants and was very comfortable all day with a G19.

I love Marmot and their other shirts have been spot on with sizing. This shirt is huge. I'm 5'11" 170 lbs... bought a SMALL and it was baggy as hell.

Nice fit and sharp looking. Pretty impressed with this shirt. Fits true to size.

I bought these as a gift for my dad and he has gone out to buy several of the same shirt but in different colors. He loves the fit and the comfort but also enjoys the casual style. I now make fun of him whenever i see him because he is ALWAYS in this shirt.

Marmot does a fine job creating a product that rides the line between stylish for casual use yet functional for when I might head to the trail. The fabric is durable yet light and am not afraid to take it on the trail with me.

This has become my favorite summer shirt. I wear not just for outdoor activity but as a casual around town shirt. It has a nice soft feel to it and is very comfortable, and it looks good. I'm kind of a "tweener" on sizes between Large and Medium depending on the shirt. I got this in Medium, and it has a generous fit, which means it fits perfectly on someone like me who is kind of between sizes. It's also wrinkle-free out of the dryer. I love this shirt.

I have two of these shirts and liked them very much until they kept snagging on nearly everything, chairs, washers, jackets, etc. Both shirts are no longer usable.

If you workout and you're 5'8" or so it can be difficult to find a shirt that fits well around the chest and shoulders but isn't so long that it goes way past your crotch. I've used it for work, backpacking and travel and its held up great. Not a lot of stretch in it but it's not advertised as such so no biggie. I've used it in temps from 60-90 and it dries really quick when its hot and humid out. I've worn it when I'm running and jumping over stuff in training and it still looks good when you're chilling out at a casual party.

Very nice shirt, top quality and worth the $$$.

I got my brother this shirt as a birthday gift. He said it is more of a baggy fit and hangs longer with a squared bottom. Nicer office-style look made with denser satiny fabric. Good collar.

I got this shirt so I was not always wearing beat up cotton tees. The shirt looks really nice but I could have probably sized down. Most T Shirts I wear are an XL but this as a button down was much larger than expected. I still kept it because it looked nice and did not look too ridiculous. if I purchased another one I would size down.

These is a comfortable and breathable shirt. I have largely worn it casually, as it is not as comfortable or sweat wicking as other hiking shirts I have (e.g., Prana). Great design, but does run a bit large (not a slim fit).

Very comfortable shirt. Handles sweat well. The material of the shirt is little heavier than I expected, but doesn't feel that way when worn.

Shirt is great and fits really well. The only thing I was a little surprised about was the shirt was a little thicker than I thought it would be. It has great SPF protection and is very breathable, was just used to some of their other shirts.

Very comfortable, light weight, nice fitting shirt. Runs a little large. I'm a skinny 6'/30" waist and the ended up going with a SM after first ordering a MD. It can be difficult as a very slim person to find these shirts that don't billow out and look weird but this fit me really well. Shirt is great for anything: Hiking, casual day trip, work shirt. I am really pleased with it.

Really like it
the size is a little bigger than expected.

This is such a great shirt and our son was disappointed that it was too big for him. Lightweight fabric and clean simple styling.

I have several of Marmot's shirts. Sit well on shoulders.
Comfortable for outdoor work and sophisticated enough for a lunch date.

What more can you ask for? This is an amazing shirt, probably one of the most versatile you will find...hiking, casual night on the town, office business casual, commuter cycling...all check! Love the material feel on the skin, akin to the best merino wool, but it is different. Dries fast, and so far no funk smell. It does seem to breathe well, but I can't be 100% definitive on that just yet. Sizing wise, I think it's true to size. I am 5' 8", 35 in waist, and 46 in chest. Med fits well, slightly tight in the chest. I also ordered a Large, it too fits ok, slightly big. I kept both. If you are a weight lifter, go for the L, otherwise the Med is the way to go.