I'm a big fan of the Smartwool PhD Ski Lights. Maybe five pairs, and they're comfy, warm, and I can get two days of use without them smelling or getting grungy.
Just got a pair of Fits Ski OTC (made in the old Smartwool factory here in the US), and they've definitely got a better heel pocket than the Smartwool. Might move to those as my Smartwools die.
Be sure that the cushioning thickness is similar between the socks you get and the ones that you have, as the sock size that you fit your boots is what your liners are used to.
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