The pillow that the Messenger of Allah ﷺ used to recline upon was made of leather stuffed with palm fibers.
كان وسادة رسول الله ﷺ التي يتكئ عليها من أدم حشوها ليف.
Muslim narrated it in the Book of Clothing and Adornment (37:2082), from Abu Bakr bin Abu Shayba, who said, Abdah bin Sulayman told us, from Hisham bin Urwa, from his father, from Ayesha, and he related it.