If you ever wondered, what I think is supposed to be the lightest Yonex step in boot, the Aerio AB, is 3lbs 4 oz per 27.0 boot, added to sheet.
Seems like well made boot, very stiff sole, flex seems good for bc riding, for my wife /oldest daughter so I can’t try on and say much. Pretty easy to get on sale from Rakuten (Japanese ebay) using an intermediary (personalshopperj.com for 10% charge. Just over $100 to ship boots and two sets of bindings in a big box almost 2′ square.