I have been using the Assos cycling caps for a number of years - the older style with 6 cotton panels and 2 mesh panels in the rear, with "ASSOS" on each side of the cap, and with their logo on both faces of the bill/brim. These always were very comfortable caps, with no ventilation issues and a reasonable amount of UV screening on the tops and sides under the helmet vent holes. (without a cycling cap under the helmet, my forehead would resemble a Star Trek Romulan!) The only reason they needed replacing after 3-4 years use was because they would fade and the lettering would wear away - hand washed after each ride,~5000 miles/year.
This new style cap is a much tighter fit, enough so that it feels a bit constricting - unlike the old style ASSOS cap. And when I flipped the bill up after removing the helmet it made a sound like several stitches popping! I also noted that unlike the older caps, the logo is not printed on both sides of the brim/bill.
I am not sure how well it will last, or how much UV protection it will offer. I haven't tried any other post-covid manufactured caps, so don't know how this cap construction and quality compares to other current caps. But after my last 2 ASSOS caps, this one is a bit disappointing on first inspection.
This cap fits nicely under my helmet and keeps the sun out of my eyes. It washes well, holding its shape. The lightweight of the fabric isn't too warm for hot rides.
I like to wear caps under my helmet for the shade provided by the shirt brim, but it's hard to find caps that also assist with managing sweat. I avoid cotton caps for that reason but seems they are the most prevalent type offered. This Assos cap is great - the short bill provides some shade, the cap itself wicks sweat and is thin enough that I don't have any for issues with my helmet. Importantly, the cap stands up well to machine washing and air drying.
Large enough for my 7 1/2+ noggin. Most caps shrink and become too small. This, I hand wash and dry. No shrinkage. Sturdy brim flips up when necessary. Cap is perforated fabric for hot summer days. I bought every color. Finally a 5 star Cap.