EXTREME LENGTH sealer 150 ml EXTREME LENGTH sealer 150 ml EXTREME LENGTH sealer is a lightweight, silicone-free leave-in conditioner that helps protect, seal, and lengthen fragile and brittle hair. Formulated with a blend of natural oils, botanical extracts and amino acids, this sealer helps to protect and strengthen hair from heat damage, and seals split ends for long-lasting length. Its lightweight formula and natural ingredients make it ideal for all hair types, including color and chemically treated hair.