Retinol & Vitamin C the benefits of 2 ingredients, in 1 sheet mask. Our fusion sheet mask delivers the benefits of two powerful ingredients plus the added hydration of hyaluronic acid. Apply to clean, dry, and optionally toned skin. Leave mask on for 10-15 minutes. No need to rinse! Allow skin to absorb nutrients and proceed with usual skin care regimen. May be refrigerated before use for a cooling effect. Our masks are gentle and may be used every day. Slight tingling is normal. Discontinue use if strong tingling occurs.