These are very warm bibshorts. A wide strap running up the middle of the back, wide and thick chamois, extra layer of fabric (hammock) under the chamois, high back panel supporting the kidneys and overall more robust fabrics all contribute to the warmth of this short and after using them twice in 95° heat they went in the drawer for the remainder of the summer in favor of lighter shorts from Assos or Rapha. To be fair, 7Mesh doesn't market them as summerweight shorts and it isn't a deal breaker but those in very warm climates should keep this in mind.
I'm 5'8", 200 lb and XL fits fine. Craftsmanship is excellent and the fabric is robust. I have the feeling that these will last a long time. The Y shaped yoke is different but effective. I use a base layers all the time, even in summer and so cannot comment on how the shoulder straps feel next to the skin but they are very stable and never dug in.
The chamois is easily the most comfortable I've ever ridden. Elastic Interface has done an amazing job. Wide and thick with excellent coverage in front, it is made of several foam densities with the densest foam under the sit bones.
Warmth, extra comfortable chamois, robust fabrics and a higher cut back adding stability and support make this short my choice for long rides in cooler weather, especially rough gravel rides.
-1 star for overheating me in the summer but otherwise an excellent product for cooler weather in warm climates.