Unless you live somewhere frigid like Vermont, I don't see much of a need for insulated pants. I expected insulation in the seat and knees, but it's actually throughout the entire legs. It's light insulation, but still, how often do your legs get uncomfortably cold? I bought them because I got a gift cert late in the season and most other bibs were already sold out (and my previous pants are shredded, so I needed new ones ASAP). That being said, the fit is excellent. Most sizing charts put me in a M based on waist (32-34), but M's don't actually fit because my hips and butt are too big, so i ordered a L. I was worried that the large might be too big, but it fits perfectly. They're slightly baggy due to me sizing up, but really the silhouette strikes a perfect balance between slim and baggy when you're also geared up in boots and headwear. When it gets warmer I'm just going to have to hope that opening up the vents and wearing shorts underneath instead of baselayer pants is enough to keep me from overheating.