The bedding of the Messenger of Allah ﷺ was made of leather stuffed with palm fibers.
حدثنا عبد الله بن سعيد حدثنا عبد الله بن نمير وأبو خالد عن هشام بن عروة عن أبيه
كان ضجاع رسول الله ﷺ أدما حشوه ليف
Narrated by Muslim in "Clothing and Adornment," chapter on humility in dress, etc., no. 38/2082, from the hadith of Ibn Numayr, through this chain.