Dynafit X4 Speed Sock

Retailers' Descriptions

Here's what other sites are saying:

The same ridge you skin up in the winter becomes the venue for your summer runs when you slip on the Dynafit X4 Speed MTN Sock and let your feet do all the work. Between your foot and your trail running shoe, this ultralight sock provides the dynamic interface to keep your foot dry and ever-prepared for the next stride on the loose scree trail.

- Backcountry.com

Dynafit X4 Speed Sock

previously retailed for:

The Dynafit X4 Speed Sock is not available from the stores we monitor. It was last seen April 4, 2015 at Backcountry.com.

If you're looking for a new running sock, check out the best reviewed current models.