The Messenger of Allah wiped over the top and the bottom of the leather socks.  

أَنَّ رَسُولَ اللَّهِ ﷺ مَسَحَ أَعْلَى الْخُفِّ وَأَسْفَلَهُ  

"The Messenger of Allah passed by a man who was performing ablution and washing his leather socks. He gestures with his hand, (and said): 'Rather I have been commanded to wipe them.' The Messenger of Allah gestured with his hand like this, from the tips of the toes to the base of the shin, tracing lines with his fingers."  

مَرَّ رَسُولُ اللَّهِ ﷺ بِرَجُلٍ يَتَوَضَّأُ وَيَغْسِلُ خُفَّيْهِ فَقَالَ بِيَدِهِ كَأَنَّهُ دَفَعَهُ إِنَّمَا أُمِرْتَ بِالْمَسْحِ وَقَالَ رَسُولُ اللَّهِ ﷺ بِيَدِهِ هَكَذَا مِنْ أَطْرَافِ الأَصَابِعِ إِلَى أَصْلِ السَّاقِ وَخَطَّطَ بِالأَصَابِعِ