I can't say enough good things about these gloves. They are the perfect weight and fit for colder temps down to 40's. I have used a lot of gloves from road brands that are much more expensive, and these are my favorite.
Had the same pair that were near 7 years old and wore out. These are as comfortable but don't have silicone grips at the lower leg opening, which the older model featured. They ride up as you ride.
I'm 54, 5'10 and ride mostly hard tail or gravel bikes in the winter. I tend to do mostly climbing where I wear just a thin, windproof glove as otherwise my hands get hot and sweaty. These gloves I throw in by bag or in my pocket for the downhill. Once at the top I grab my windbreaker and these gloves to keep my from getting chilled on the decent. They provide great wind protection and a good amount of warmth. Though, if I'm going anywhere near 30mph, my fingers can still get slightly cold, but not enough to impair my ability to break. I'm a huge fan of Castelli, especially the winter gear!
When temps range from the lower 40s into the 50s the insulation and dexterity of the Perfetto ROS glove is an ideal choice. It is warm enough to take the bite out cold winds, form-fitting without being too tight, and resists water should you get caught in a bit of rain. It won't be your glove of choice in freezing conditions, but it doesn't make that claim. Castelli has other options then. I'd give it a 5 if there was a tad bit more cushion against the bars for those long days in the saddle... but that being said, it's still a comfortable glove.