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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.

Performance Features

Made with ultra-soft nylon treated with silver-ion technology for anti-bacterial odor and moisture wicking ability

Cushioned with Nano Bamboo Charcoal ionized fibers for durable softness

Skin Thin ™ Technology to increase air flow and temperature regulation

Seamless construction

Left/right design for anatomical fit

Y-Gore heel

Hand wash and hang dry only

Do not wash with bleach or a product that contains bleach

Comes with one (1) pair of socks per package.