I know reviews can be frustrating because they often seem to contradict one another. I can only speak from my personal experience; I will try to be as objective as possible.
Inseam length: Columbia sells three different inseam lengths; short, normal, long. Unless specified otherwise, I would assume a normal inseam length when ordering this pant. I ordered a large; the inseam length is 32 inches.
Waist size: These pants come with adjustable Velcro tabs on the hips, which allow you to change the waist size. The large can be adjusted between 35 - 38 inches. It also comes with belt loops, but the Velcro tabs work perfectly and there would be no reason to wear a belt (other than for fashion purposes).
General sizing: While the pants have a "loose fit" through the thighs, it would be very difficult to wear anything other long underwear beneath the pants. There simply is not enough room for jeans or thicker fleece pants to be worn underneath.
Insulation: This pant has no insulation. It does, however, use the Omni heat technology. Basically, your body heat reflects off the interior surface of the pants to create heat. I have worn these pants with just long underwear underneath and I stayed plenty warm in freezing temperatures.
Pockets: These pants come with several pockets, all of which have zippers. Some of the pockets have zippers and Velcro over the zipper.
Waterproof: 100% waterproof, includes elastic gaiters to keep snow from coming up inside of the pant legs.
Hopefully this review will help you make a decision regarding this pants !
Ideal for staying dry and warm during winter weather activities, these versatile waterproof-breathable pants feature a fully seam-sealed exterior with a heat-keeping, thermo-regulating Omni-Heat thermal reflective lining. Features like leg venting, an internal leg gaiter, articulated knees and reinforced cuff guard make them ideal for hard-charging aerobic cold-weather endeavors.