The sandals of the Messenger of Allah ﷺ had two straps.
أخبرنا عمرو بن علي قال حدثنا صفوان بن عيسى قال حدثنا هشام عن محمد
كان لنعل رسول الله ﷺ قبالان
No references are available.
Sahih. Nasai alone narrated it.Hisham is Ibn Hassan, and Muhammad is Ibn Sirin. Amr bin Aws Thaqafi Taifi is a major successor, and whoever counted him among the companions was mistaken.