What are some good products that make very curly hair, more wavy ?
You really can't change your hair texture unless you straighten it then use a wavy curling wand or something.
This typically isn't possible without some type of chemical treatment to your hair, like keratin treatment or a "tex-lax" which means "texture relaxer". These make tighter curl patterns wavier temporarily. You can also give yourself a blow-out that will let you go back to curly hair as soon as you wash. Here's how.