Take the following steps to make your hair voluminous without blow drying it:
1. Take a shower and wrap a towel around your head to soak excess water.
2. Spritz your hair on top with a sea salt spray 4-5 times, push the front section back and spritz it with a hair spray too.
3. Scoop a tad of a putty or another hair styling product with a strong hold, rub between your palms and work it into your locks on top.
4. Comb the hair to the side and let it air dry for around 20 mins.
5. Rake the hair with your fingers to dishevel it and allow it to air dry for another 20 mins.
6. Shape the hair in the way you like.