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Under a shoe cover that's not likely to be much of an issue though? Certainly still more aero than my 3-strap Shimano.
They're more expensive than the old SLX model https://www.sigmasports.com/item/Giro/Empire-Road-Cycling-Shoes/MPKA?s=1
I'd hazard that the original Empires would be more aero than either version of SLX - too much texture on the sides.
Could be bollocks though.