The warm weather traveler would do well to consider wool socks for four-season use. Even in the summer mid- to lightweight wool socks provide an excellent combination of durability, blister prevention, natural odor protection, and comfort. This is something most hikers, bikers, and runners already know. The key is wool’s moisture wicking qualities means you feet stay drier, which helps prevent blisters. I did a June trip where I walked about ten times more than normal without a single blister. But aren’t they hot? Not in my experience, but as with all travel clothing you should test your gear before you go — under similar conditions if possible. 
Socks designated as “light hikers” are usually appropriate for summer. I find that about three pairs of wool socks will get me through a trip of any length. And if you like to look snazzy, Smartwool makes some really cool color combinations.