The SmartWool PhD Ultra Light Micro Running Sock for women proves you don't need wires and silicone to be hi-tech. You just need smarts, like the new and improved 4 Degree Elite Fit System which makes these socks even more comfortable than before. Patent pending Reliawool technology that is more durable, improves wear and makes a thousand miles underfoot nothing but a thousand miles of fresh air, good memories and great views.

• New 4 Degree Elite Fit System uses two elastics for greater stretch and recovery to keep the sock in place
• Patent pending ReliaWool Technology in high impact areas provides the longer lasting protection to keep feet comfortable
• Low Profile and durable virtually seamless toe
• Alternating 1x1 welt
• 1.5" overall height
• 54% Merino Wool, 44% Nylon, 2% Elastane