On Monday, January 25th only, when you buy any daily haircare masque, you'll receive a Noctogenist overnight hair treatment for half price. Just visit kerastase-usa.com on Monday and enter the code SERUM for thick hair or VOILE for fine hair. You'll also get free shipping on every purchase made that day on the site. (Free shipping is totally my downfall. I cannot resist it because I hate paying for shipping. If I'm ordering on Amazon, I will buy extra stuff just to make the free shipping amount). Have fun shopping!