I have purchased both. The Costco ones are priced appropriately to their quality and suitability for skiing compared to the Lenz socks.
Having used various brands of heated socks and the thermic boot heaters, I think the installed boot heater is the best option if installed well. Socks work well in touring and cross over boots but really don’t have the room to fit them in the resort boots. Be interested to try the Sidas option if they are an actual ultralight sock thickness.
Boot heaters are also generally more economical than the socks IMO.
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