Hair mousse is a hair styling product that is dispensed in an aerosol foam spray. Hair mousse adds volume to hair and often provides both conditioning and hold. One of the lighter weight hair styling products, hair mousse is applied to wet hair before drying and styling. Hair mousse may also be referred to as styling foam.

As a versatile hair styling product, hair mousse is a popular choice for both short and long hairstyles. When hair mousse is applied to wet hair that is allowed to air dry, the hair is often left with a “wet” look that can be “crunchy” feeling, but unlike hair gel, hair mousse combs out easily for a softer look. When hair mousse is applied to wet hair that is dried with a hair dryer, it provides additional volume and hold.