In reply to anthonyecc: smartwool are good, but are not far superior,
the difference in wool content in thorlo varies according to model, this is because they use synthetic fibres just like in a wicking t shirt, but in thorlo mtn socks they use lots of wool for insulation,
smartwool are obviously merino which is nice but is less durable than other wool to abrasion from the boot, bridgedale make durable socks, and do good summer light socks too, using synthetic blend
for summer light and trainer use i like bridgedale
midweight i like thorlo light hiker or lambswool blend light hiker
for winter i like smartwool and extremities( made by someone else obviously) favourite mtn sock ever was a patagonia one from about 8 years ago before they changed, most durable comfy mtn sock i ever had