Edit - saw your link above... dunno about upper limit of sizes but H&M do cheap shit shoes - https://m2.hm.com/m/en_gb/productpage.0630304002.html
H&M seem to max out at 11. In this case 'turning it up to 11' isn't good enough ;)
@hippy started
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Edit - saw your link above... dunno about upper limit of sizes but H&M do cheap shit shoes - https://m2.hm.com/m/en_gb/productpage.0630304002.html