The absence of silicones and parabens directly shapes the sensory experience and performance of this shampoo. Silicones are often used to coat hair strands, providing immediate slip and a glossy, smooth feel. Without them, the shampoo does not leave a "heavy film" or engage in "glossy masking." Your hair is likely to feel clean in a more natural, lightweight way—the texture of your actual hair is more apparent, which some people prefer for volume and body, especially at the roots.
Parabens are preservatives; their absence is a formulation choice common in many modern cosmetics. For you, the practical impact is that the shampoo is designed for "regular cleansing without a heavy film and unnecessary 'glossy masking'." This can be particularly beneficial if you use styling products regularly, as it may help prevent buildup that weighs hair down. It also means the shampoo creates a "cleaner base" that allows subsequent care products—like conditioners, serums, or masks—to absorb and perform more effectively, as they are not applied over a silicone barrier.
The result is hair that feels clean and manageable but not artificially slick or coated. If you are accustomed to silicone-rich shampoos, your hair may initially feel less slippery when wet. This is normal. The hydrolyzed wheat protein, panthenol, and glycerin work to provide manageability and a cared-for look through different mechanisms, focusing on the hair's condition rather than surface coating.