I do a lot of road riding with an average ride of 50 miles. My first bib was a Giro halter but in shorter length and not thermal. It has lasted for years and has the best chamois pad. When I saw this online, I knew it would be a quality product. I bought a small and it is true to size. I am perhaps between a small and medium. The compression is high and the thickness of the thermal is significant, so much so that it felt like the material pulled on my kneecaps with my first ride and the back of the halter fought with the height of my sports bra. After the first wash and wear it feels better and I know I will enjoy this bib for years to come.