Just out of the gate, these are hydrogel masks, meaning the material adheres better to the skin, is more "cooling," but is also distinctly slippery. Hydrogel vs. cotton sheet mask is a personal preference, but the TCFS Egg Cream Masks are some of the few hydrogel masks I really like. I'm not overly endeared to the rest of the Egg line, but these masks provide excellent hydration without irritating the skin.