Wow a snowboard!
Was this the very first Sonic snowboard to be made? It could be, because it uses the "Segasonic" branding that was not continued all the way through the classic era. Sonic is well known to snowboard in his games, so he's a good fit for this extreme sports equipment item.
The bottom of the board has the fully shaded 'spinning Sonic/rolling Sonic' art at the front. A rather odd / shiny /shadowed blue font is used to spell out Segasonic , trailing behind him. The underside has a yellow to red fade with a bit of an air-brush look.
The top of the board is red/fade yellow with black accents & a patern of fine red lines. The front here has an early 'spin/face' silouhette / logo thing in a speed circle. The same odd font spells out Segasonic again, and beneath that is the Sega logo /copyright.
This board doesn't have the boot mounts attached, they go into those holes there. This was always a very costly item. Snowboards are ordinarily quite expensive because they have to be large, thick & use quality materials. A real, branded authentic board is of course, worth even more money. So this item checks off sevreal 'expense indicators' which are vintage, costly at the start, uncommon to begin with, & large. This is a very cool sight to see!