No heat curls

I have hair down to my waist and I've been wanting to try something different, I always have it up in a bun to keep it out of the way, but I'd like to wear it down and embrace it. What are some ways I can curl it without applying heat to it so it doesn't get damaged? What has worked for you? And what products do you think I should use to help the curls or waves keep their shape all day? A few years back, I used to curl it with heat and I always had issues with them losing their shape before the end of the day. Sorry for all the questions 🤗