From ca'an; perhaps a military boot (as a protection from mud -- battle.
see HEBREW ca'an
H5430. seon
[סְאוֺן ?] noun [masculine] sandal, boot of soldier (probably loan-word from Assyrian šênu, shoe, sandal (of leather), DlHWB 634 WklTel Amarna, Glossary, whence (denominative) šênu, put on sandals Dll.c.; compare Aramaic סֵינָא, , , sandal (verb denominative ); Ethiopic sandal); — probably construct סֹאֵן כָּלסְֿאוֺן Isaiah 9:4 every boot of one tramping (absolute Du al).