Last Downhill Boots Size 37, US Size 6

Really love these boots but they are a size too small and I missed the return window. Worn 3-4 times. I’m typically a size 7 and these fit more like a 6-6.5. These are a Scandinavian brand, the box says the US size is a 5, but I think that’s incorrect. I don’t have the original box anymore. Retails on Shopbop for $135.