You can change the texture of your curls without heat by making the braids bigger for bigger curls or smaller for smaller curls or you can twist your hair.
I do this so that it will be easier for me to style (throw it up in a bun) and I don't do this every night because I don't like for the products to weigh down my hair. When I don't do this I lightly braid it into one big braid and don't use any products.
Hope this helps!!