A salon splurge that’s worth it, Kérastase’s indulgent duo tied for best in the GH Beauty Lab’s volumizing shampoos and conditioners test for thickening strands using ingredients like peptides and hyaluronic acid. Testers “loved” this fine-hair “Holy Grail” that “truly worked” for “all-day body.” These won for thickening strands and making styles fuller compared with other shampoos and conditioners, data revealed, and also earned top points for weightlessness.