Wow, such a comfy chamois and leg openings. I always struggle finding bibs that can handle my thighs without squeezing them off at the knee. I’m 5’6 and 64kg, these have plenty of stretch left in the bib section, I like the laser cut material and softness. These didn’t have the buckle on the chest like displayed, but I bought the sale style, so maybe I misread the description. My first ride in them was 4 hours straight on a trainer and didn’t have the expected chafing in the bikini line or anything. I don’t know if they’d last 12 hours on a trainer but definitely 12 hours outdoors with breaks. Overall, my new favorite bib, plan to get more!