It is reported from Ali (Radiallahu Anhu):
"Rasullullah (Sallallahu alaihe wasallam) was neither very tall nor very short. The soles of both feet were very fleshed. (This quality is praiseworthy in a man as it denotes strength and courage but is not praiseworthy for a woman). He had a large head. The joints of the bones was also large. There was a thin line of hair from the chest to the navel. When Rasulullah (Sallallahu alaihe wasallam) walked, it appeared that he was descending from a high place". Ali (Radiallahu Anhu) says: "I did not see anyone like him neither before him, nor after him".
Arabic/English book reference: Book 1, Hadith 5