Just received my undies in the mail, lovely cotton, love the fit. I would say personally they run big. I would generally order a size large from other brands - but I find these to be a little too large. I am crossing my fingers for shrinking in a hot wash. If I reordered I would order a medium. That being said, as a Calgarian, and a long time searcher of the perfect cotton undies…in a medium, these would be perfect & I would order again. So happy to support a local Canadian company, good job lad...