Hair Keratin: This indicates the key ingredient. Keratin is a protein that is a primary structural component of hair. A keratin-based product is designed to fortify hair strands, fill in gaps in the hair cuticle, and make hair stronger, smoother, and less prone to frizz and breakage.

Hair Mask: This is the product category. A hair mask is a deep conditioning treatment that is more intensive than a regular conditioner. It's meant to be applied to the hair and left on for a period of time to allow the ingredients to penetrate the hair shaft and provide deep nourishment and repair.

Moisturizing Smoothing: These are the key benefits and purposes of the mask.

Moisturizing: The formula is designed to provide intense hydration to dry and dehydrated hair.

Smoothing: The formula is designed to tame frizzy hair, reduce flyaways, and create a smooth, sleek finish. The combination of keratin and moisturizing ingredients helps to achieve this by sealing the hair cuticle.

500ML: This specifies the volume of the product in milliliters. 500 milliliters is a standard, large-sized container for a hair mask, indicating that it is intended for frequent use.

Inferred Features and Benefits:

Repairs Damaged Hair: The keratin content suggests it is suitable for repairing hair that is damaged from heat styling, chemical treatments, or environmental factors.

Reduces Frizz: The smoothing properties are ideal for those with frizzy, unmanageable hair.

Leaves Hair Softer: The moisturizing ingredients will leave the hair feeling soft, silky, and more manageable.