I really like these pants! I've only used them on warm (20-25 Celcius) summer days so far but they kept me warm while standing in the river and weren't hot when walking around. I've warn them under MEC pants and shorts. Fit was perfect; I'm 6 feet tall, slim build (155 pounds), waist 32 cm and the large fit me perfectly. If I had the same dimensions, but with a bit bigger gut, the large would still do OK. Free shipping was as advertised and came in a timely manner. I recommend these for any fly fisher(person). Be aware that the neoprene is a bit stinky out of the bag and needs to be aired out for a couple of days in a well ventilated area (i.e. garage).