Basically, I use paper bags by rolling then tieing my hair with it and sleep on it overnight (tutorial on youtube). Or use hair ties and fold your strand of hair into pieces and tie it (tutorial on youtube). Also a bun with my twists works. Or just roll your hair in those (non heat needed) curlers for a long time.posted about 2 years ago
When I want some voluminous curls withou using any heat, i just catch my hair, when it’s quarter dry, in a high bun. Then i just wait for my hair to complete dry and I have the most lovely voluminous curls. When I’m in hurry and I don’t have time to let it dry naturally, i dry it with dryer, when it’s catch in a bun.
Hope I helped you!