I am a 36 in most pants. I wear a 36 attack year round (tighter) and have a pair of 38s for when I want long Johns. Athletic now days means skinny. I have a bit larger build and the pants are a bit tight but way better fit than some other athletic outdoor wear. I have to size up a size or two for upper wear but the pants are close. If you like a bit more loose just go up a size, if not get your normal size.