If humidity has ever sabotaged your hair plans, you're not alone - and neither are the Nader sisters! The model siblings are famous for their glossy blowouts on Love Thy Nader, where nonstop travel and filming demand serious staying power. Their secret weapon? A surprisingly affordable $9 blowout spray. Mary Holland Nader and Brooks Nader revealed their secret to sleek, shiny hair: John Frieda Frizz Ease Blowout Spray. Brooks described it as "a blowout in a bottle," while Mary Holland added that it makes her hair "look like glass.