Reference for Nedarim 112:3
איתמר איזהו מטה ואיזהו דרגש אמר רבי ירמיה מטה מסרגין אותה על גבה דרגש מסרגין אותו מגופו מיתיבי כלי עץ מאימתי מקבלין טומאה המטה והעריסה משישופם בעור הדג ואי מטה מסתרגת על גבה למה לי שיפת עור הדג
who frequented the leather-workers' market, and he told me, What is dargesh.? A leather bed.<span class="x" onmousemove="('comment',' Its strapping consisted of leather instead of ropes. Not being supported by long legs it stood very low. For this reason it is disputed in the Mishnah whether it is included in bed or not, and also whether it needs lowering during mourning. v. Sanh. (Sonc. ed.) p. 107, n. 1. ');"><sup>5</sup></span> It has been stated: What is a mittah, and what a dargesh? — R. Jeremiah said, [In] a mittah [a bedstead] the strapwork is drawn on top; a dargesh has the strapwork inside.<span class="x" onmousemove="('comment',' The straps are attached on the inside through slits in the frame. ');"><sup>6</sup></span>