Tips: We utilize premium essence in our eye masks, and they may initially slide upon application. Ensure there is no air between your skin and the masks, then hold the masks in place about 1 minute initially. Alternatively, you can directly remove any excess essence, the eye masks will stay put. Storage: Store in a cool, dry place within the temperature range of 0°C/32°F to 45°C/113°F, away from direct sunlight. Avoid placing it in proximity to hot areas such as in a car or near a heater, as well as extremely cold areas below 0°C/32°F. Extreme temperatures may damage the product.