When you're looking for more control in your boots and need a lighter sock; go with the PhD ultra light. Still has warmth and quality you expect from smartwool without the extra weight. Could be warmer, but what you would expect from a light ski sock.
These socks are terrific on warmer days. Thin and light and breathable. However on cold days where slush may get in your boot these will not keep you warm. But you shouldnt be wearing ultra lights on those days anyway. These also provide excellent compression to keep the circulation going without feeling overbearingly tight or uncomfortable.
Listen, I have worse than average smells radiating from in between my toes. I need something lightweight, protect, warm and most importantly, "stank-resistant." These socks do all of the above, and even after a week of boarding all day, ery day, the socks smelled brand new. No wholes, no blisters, no stank, no problem. Get 'em while they're hot!
This was my first pair of Smartwool sock and they have held up so well I have purchased three more pair of Smartwool for work socks, they feel great, let your feet breathe even in leather dress shoes and look as good as any dress sock. They are great year round and best of all, your feet won't smell, well ok, maybe not as bad.