I use VO 5 for years. You can always tell when I haven’t used it for a long while. My hair gets flat and dull. I don’t care for hair conditioners that you use in the shower. I just like VO5. It lasts a long time. Put a dab of it on your hands, you rub it on both and work it from the ends of your hair through the rest. My ends need it most. Not my scalp. But it leaves my hair shiny and full and it always feels thicker for some reason. You use it after your hair is dry and I usually use it between shampoos. I also use coconut oil for the scalp and for a quick shine and nice scent, rose oil. You could use coconut oil but I find when I go out in the sun, it makes my hair feel stiff. Rose oil leaves it feeling soft to the touch, even in full sun.
Though I always recommend using sunblock on your hair in the summer. It doesn’t feel as nice but it will keep your hair from sun damage. Especially use it if you are going into a chlorine pool and you plan to sunbathe.