I bought these for winter riding after buying and returning Gerbing EX Heated Pants due to massive sizing problems admitted by the vendor. I ordered them in 5x even though I wear a size 46 waist. I wanted them way too big so I would not have to use the side zippers at all...and I very much did not have to. I had to use half the take up room afforded by the velcro sizing bands on the waist.. Yet even though unstressed, after about 10 uses in commutting, the fly zipper failed. I actually bought another pair so I could have two on hand. They are that good otherwise.