The OS1st AC4 Active Comfort Quarter Crew Socks were made for staying comfortable all-day and any activity with plush bamboo charcoal cushion in the heel and toe and ultra-thin Skin Thin™ cooling panels on the top. For the best fit, it is important to use the size chart before ordering.

PERFORMANCE FEATURES:

• Extra cushion in the heel and toe
• Bamboo charcoal ionized fibers for durable softness
• Ultra-thin top panel to regulate temperature and increase air flow
• Micro-nylon treated with silver-ion technology to keep dry and prevent odor
• Seamless construction and left/right design for 360-degree blister protection
• Y-Gore heel to prevent the sock from slipping down into your shoe
• Comes with one (1) pair of socks per package.
• Item #: 100441,3,5,7

SIZING:

• Small - Average Shoe Size (U.S. M4.5-6.5, W5-7.5)
• Medium - Average Shoe Size (U.S. M7-10, W8-11)
• Large - Average Shoe Size (U.S. M10.5-13, W11.5+)
• X-Large - Average Shoe Size (U.S. M13.5+)