Height
Running socks are mostly no-show, ankle or quarter. Hiking socks add micro crew, crew and taller, so a boot collar rubs sock, not skin.
Cushion and knit
Running socks stay thin to fit a close running shoe. Hiking socks run from lightweight to heavyweight, and full cushion fills a boot with room.
When a running sock works for hiking
In trail runners or low hikers on a dry day hike, a well-fitting running sock is fine. Many trail socks here, such as Injinji’s Trail and Feetures’ Elite, sit between the two.
When it doesn’t
In boots, on long days, in cold or with a heavy pack, a taller sock with more padding is the safer choice.
