Remove the sheet mask from its package; remove the protective plastic carefully from the cloth. Apply the sheet mask over your clean face as best as possible, lining up the holes for your nose, eyes and mouth carefully. Ensure the cloth is hugging your skin for maximum absorption. Leave on for 10-20 minutes to a maximum of 30 minutes. Relax. Remove carefully to avoid contact with eyes. Any remaining serum should be washed off. Some people choose to let the serum soak into their skin and wash in the morning/after a couple hours. This is dependent on personal preference and skin type. Toss the biodegradable mask.