Babyliss Keratin Lustre Diffuser Babyliss Keratin Lustre Diffuser Especially designed for Babyliss’ Keratin Lustre hair-dryers, this salon-worthy diffuser adds soft volume and movement to your hair so you can create loose waves and maintain frizz-free curls. Air is evenly distributed and a snap-on fit allows for better styling control. Compatible with Keratin Lustre only.