Vtg Roller Skates Riedell USA Aerobiskate Sure-Grip Black Super X Unisex 9 or 11

Vintage Roller Skates Riedell USA Aerobiskate Sure-Grip Black Super X Men 11. These are in excellent condition! The toes show very little scuffing. The wheels show very little wear, as does the toe stop. The foot bed is clean with no foot imprint. The only thing that shows a little age is the inside of the boot tongue, see photo. I can't find a size in these anywhere. I measured these with ruler and measuring tape.

The boots are 11.25 long. According to Riedell's chart, that puts these at size 11- 11.5. I think that must be a woman's size 11, so a men's size 9?

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