These bibs are very breathable because of the mesh material in the lower back region as well as the material of the shorts. It would be awesome for hot summer rides. The chamois is very well constructed and would be sweet on century rides. Sugoi makes quality products. I own a bunch of the Sugoi RS shorts with the green Formula FX chamois and these bibs have an even more amazing chamois- the FXR. Unfortunately, I've lost weight and the XS Sugoi are now too wide for me and the shorts shift around. I was really hoping that the bibs would run small but the bibs are true to size. I really wanted to fit into these bibs because of the awesome chamois. I am tempted to eat gelato every day just so I can fit into these. :) The one thing I was not so crazy about were the straps which did not lay as flat against the skin as I would have liked. But as I wore it for 5 minutes and got used to the sensation, I did not notice the straps much.