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.

• 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 â„¢ 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