How should I apply this mask to get the best effect on the neck and jawline area?

Start with clean, slightly damp skin — this helps the corn and olive oil base spread evenly. Using clean fingertips or a flat brush, apply a generous, even layer (about 2–3 mm thick) from the center of the chin outward along the jawline, then continue downward over the entire front and sides of the neck. The neck skin is thinner and has fewer sebaceous glands, so it benefits from a slightly thicker application than the face. Leave the mask on for the time indicated on the packaging (typically 15–20 minutes for collagen-based sheet or cream masks of this type). Do not let it dry completely to a stiff film; if it starts feeling tight, mist lightly with thermal water or toner. Remove by rinsing with lukewarm water or wiping gently with a soft damp cloth — avoid rubbing, which can irritate the botanical extracts (horsetail, ginkgo) and essential oils. Follow with your usual serum and moisturizer while the skin is still damp to lock in the hydration from the shark oil and fucus. Use 1–2 times per week; more frequent use won't increase the tightening sensation and may sensitize reactive skin.