There are suction cups on the back of the waterproof bath pillow to ensure that the edge of the bath pillow stays in place, giving you strong head and neck support in the bathtub for a truly relaxing spa bathing experience. The Waterproof Comfort Black Bath Pillow is engineered to provide greater comfort and allow your body to relax. This portable bath mat uses ergonomic foam. So you can read or watch videos in the bathtub. A better way to relax. The easy-to-install suction cups on the back keep this pillow securely attached to the bathtub. Simply pick up the suction cup and place it where you want it. Press firmly to grip all suction cups. To remove, gently pull on the nub on each suction cup and use a card to separate it from the tub. Applicable This bath pillow is suitable for adults. A must for those who love to enjoy a hot spring bath.