I've tried Castelli Sorpasso bib tights, LG bib tights, Bontrager bib tights and these. And these are by far the best ones I've tried. First of all the stitching and materials are of high quality. While putting on the Castelli Sorpasso bib tights you have to be so careful and even then it feels like the material is ripping. Not so with these. Loosen the zippers at the ankles, pull up the tights and it's like putting on bib shorts. I've ridden these in high 30's through low 50's and remained comfortably warm throughout. The chamois is great and because of that I went ahead and bough FRC bib shorts as well. I'm 6'2" weigh 182 lbs and have a 33" waist and wear a Large size.