Silicone, second only to petrolatum, is a common moisturiser ingredient that forms a barrier to limit substance penetration. Dimethicone, a silicone-based polymer also known as PDMS, is well-regarded for reducing transepidermal water loss, improving skin softness, and filling intercellular gaps in the upper Stratum Corneum layers. Dimethicone’s occlusivity, while substantial among emollients, falls short of petrolatum’s unparalleled occlusive properties.