These bibs are great- once you throw them on, you don't need to take them off until it's time to climb out of them because YOU choose to do so. The side double zips are great for ventilation while hiking, the back zips make it easy for a lady to pop a squat off the trail (guys just have it so easy), and they are super light weight and easy to move around in. They keep you super dry and at a good temperature. I am tall (5'11''), so went with a large. I think I definitely could have fit in a medium, but I am by no means swimming in these pants. I highly recommend them to any lady going into the backcountry to ski or mountaineer.