58 Genius Beauty Launches You Need to Know This Year

The product: Redken Extreme Lengths Sealer ($24, salons only)

Why we want it: Oh, the grow out phase. When you're trying to maximize length, every quarter of an inch counts. Our favorite product in Redken's new Extreme Lengths collection is the sealer, which targets the villain of hair growth — split ends. The product is packed with biotin to fuse together stringy strands.

Available: February 2015