Kérastase Nectar Thermique gives hair optimal shine from roots to ends. Improves hair straightening and drying performance. Kérastase Nectar Thermique Is A Heat Protection Cream For Dry Hair. It protects hair from the harmful effects of heat-styling tools and nourishes, softens and moisturises hair. An intensely nourishing cream for dry hair with a thermo-protective heat-activated ingredient, which seals softness into the hair fibre and protects dry hair. This new haircare treatment will become indispensable when heat-styling dry hair: the hair fibre is intensely nourished and protected from the drying out effects of heat-styling. The results are soft, smooth, shiny hair.