2. R+Co Rodeo Star Thickening Style Foam
Scrunch the thickening foam into damp hair and blow-dry your hair into your usual 'do. You will see an immediate difference in how thick your hair is. It's not sticky and doesn't leave residue, and it's packed with ingredients like vitamin E and aloe vera leaf extract, which adds shine without weighing down your strands.

R+Co Rodeo Star Thickening Style Foam, $32, Dermstore