This is COSRX's snail mucin routine, shrunk down to travel size and bundled into one kit. Four steps, one ingredient throughline: snail secretion filtrate works through each stage, from cleansing to the final moisturizing layer, so the whole routine builds toward the same goal — a stronger, more hydrated barrier.
It's TSA-friendly, so it works just as well as a first-try sampler as it does a gift or a travel companion for someone already using the full-size versions.