FWIW I just got back from a week in the Sierras wearing a (glacial) Mountain Hardwear Crater Lake Hoody and I found it to be excellent. Extremely soft, kept me much cooler than I thought I’d be, no sunburn at all, had a great hood that never came off and offered better coverage than any other hoody I’ve tried, and the thumb loops worked well, too. It would probably feel heavier when wet than many of the more transparent looking tops I see mentioned here. Oh, and it did great in the wind, too. Even at the top of Glen Pass, with the wind blowing hard, I didn’t need to add another layer on.
I’ve previously always worn a button/collar shirt for trips, but I’m sold on these kinds of hoodies. Worked especially well with my Sunday Afternoons Ultra Adventure Hat.
I’m looking forward to trying a couple other variations of this kind of thing. We passed along a section of the JMT and probably every other guy was wearing something similar (almost always in gray). A lot of the women, too.
Not that I needed it, but the addition of a half-zip/snaps would be interesting, for really cooling off. I have my eye on the Black Diamond Apenglow Pro Hoody (which I chatted with one hiker about), and also this Skylight Gear one https://ramujica.wordpress.com/2021/08/31/gear-review-the-skylight-gear-sun-hoody-189-g-6-67-oz/
Anyway, just generally delighted by how the MH top worked out.