Sunsilk Expert Perfect Straight keeps straight hair from fluffing and frizzing up when it dries after the shower. Water clumps the hair together and weighs it down, but when the water evaporates the hair fibers can separate, leading to fluffing and frizzing. Our “straight lock technology” administers a small amount of adhesive properties into the product to hold the hair fibers together as they dry, but without sticking the hair together like a styling product.