The bed of the Messenger of Allah ﷺ on which he slept was made of leather, stuffed with palm fiber.
إنما كان فراش رسول الله ﷺ الذي ينام عليها أدما، حشوه ليف.
Bukhari narrated it in the Book of Raqaiq (6456), and Muslim in the Book of Libas (38:2082), both through Hisham bin Urwa, from his father, from Ayesha, who narrated it.