Product Information

The AC4 Active Comfort Sock uses two of OS1st's signature technologies for the ultimate comfort experience. The AC4 is built with nano-bamboo charcoal cushion where it counts and OS1st's cooling Skin Thin Technology for temperature regulation. Made for everything from exercise to everyday, this sock features blister protection, contoured padding, and light-to-moderate compression for support and fit. For the best fit, it is important to use the size chart before ordering.