Consider an Apple Watch. If you get it with cellular, it’s a little more functional than be light phone - spotify, directions, weather, etc. - but doesn’t have the issue that you cannot text from your own number because Apple allows your phone and watch to share the same number. It still lets you go out without your full phone and no apps, social media, other distractions like the light phone.
I love my apple watch! I have the series 6 with the braided band in black. I didn't know if I'd like the band, but it's great. I've also used the band that connects with velcro...the whole band was like velcro, in that it looks like short loops. I liked that as well. Pretty comfortable.
I personally love my Apple Watch. I wear it to work as an RBT so it goes through A LOT and it holds up! It’s great for working out, tracking steps, it can get wet with no issues. It’s amazing. I don’t have the cellular version but I find I don’t really need it. The range is pretty far from my phone and it still loads and acts as if it was my phone. I wish it was easier to send texts and that it had its own camera but that’s all I have for negativity. I have a sport band that’s waterproof and fits my child sized wrist lol. Water mode also works great if you have kids with touchy fingers!