hey guys, i'm looking to buy my first ripndip item, so i'm not sure about the size! hopefully someone can help out! i'm about 5'10" and about 145 pounds...should i go for a medium or a large when it comes to tshirts? how do their tshirts fit? thanks..Medium, I'm between 5'11" and 6', 165lbs and wear all mediums and the length is great but something about the shoulders and sleeves is a little thin/skinny for me, so they should be perfect for you, maybe a little long, but it isn't an all around long because it gets longer at the front and back, the sides stay higher up. A lot of people complain they are a little long, but either tuck it in like buttondowns should be worn a lot of the time or shorten them by hemming up the bottom a little.