I go caseless just because of sheer amount of bulk cases add, even the "thin" ones.
That's why I use an aramid fiber case from AliExpress. It's paper-thin, but has saved my phone from more drops than can remember. I used to go caseless, but since trying out aramid I don't see any practical benefit to caselessness.
Interesting. I tried an ultra-thin case before (though it was plastic). I dropped my phone one time with it and it shattered. The drop was pretty unforgiving. It was from head-height onto a thick marble floor. In 18 years of owning iPhones, this was my only catastrophic drop.
I think you probably can't go too wrong just searching for 600D aramid + the name of your phone and picking one from a seller with good reviews, but the specific one I have is this: https://www.aliexpress.us/item/3256805920169643.html.
Before that, I was using this one from Thinborne: https://www.amazon.com/dp/B0CHLF8FD7. For all intents and purposes, they're functionally identical. I slightly preferred the style of the AliExpress one (camera glass cover + no logo), but the main reason I went for AliExpress when I needed a replacement was that it was half the price of the Thinborne. (The AliExpress one has since gone up ~$10, but the Thinborne one doesn't appear to be available at all anymore.)
That's why I use an aramid fiber case from AliExpress. It's paper-thin, but has saved my phone from more drops than can remember. I used to go caseless, but since trying out aramid I don't see any practical benefit to caselessness.