4. What is the housing material of the FF3S? How does it feel when wearing it?

The FF3S features an aluminum alloy construction with a matte finish, making for a subtle yet obviously more luxurious appearance than found on its predecessor. Another benefit of the aluminum alloy construction is the lighter weight. Each earbud of the FF3S is only 3.9g, making each earbud 52% lighter than the FF3. This will give a whole another level of comfort for longer listening sessions, especially those with ears that are very sensitive to weight.