As a runner, your most important asset is your feet. So, take great care of your feet with WrightSock Double Layer Stride Low Cut Socks. These socks feature a patented double layer construction that reduces. Patented Double Layer construction reduces the causes leading to blisters like friction, moisture and heat. Heel tab protects the Achilles area and helps prevent slippage. Mid-weight is perfect for training or racing. This durable sock will last mile after mile. Made in the U.S.A. WrightSock™ Guarantee: Money back or sock replacement if you experience blisters or are not 100% satisfied with the performance of this sock. Simply return the socks with the original sales receipt and proof of purchase to Wrightenberry Mills, Inc. at 910 Cleveland Avenue, Burlington, NC 27217.