Used to ski the Smartwool Ski Ultralight (no cushion) until they decided to discontinue them. Switched to Point 6 Ultralight. OK, but very tight fit and hard to get on and off. Finally discovered two of the thinnest, most comfortable ski socks I've ever tried. Both are available through PSIA or National Ski Patrol on pro deals if you belong to either organization. If not, go online.
The first is Bridgedale Micro Fit ski socks (51% Be-Fresh Polyproylene/ 46% Nylon/ 3% Lycra). Thin as a dress sock, incredibly easy to get on and off, no noticeable seams, remarkably warm, as well. One thing: Your boots better fit well with nothing protruding. You will feel it if they don't!
The second is the Icebreaker snow liner, no cushion, over-the-calf ski sock. 100% merino wool. Very thin (but not as thin as the Bridgedale model above). It is a very tall sock (over my knee, actually!) but just roll the top over to the length desired.
Both are superior to the Smartwool and Point 6 in my opinion.
Best!
Mike