Swiftwick Flite XT Mid-Crew Socks Size:M Next-generation optical heart rate and

Next-generation optical heart rate and SpO2 sensors

the backpack also has a chest strap for added comfort and stability

Adjustable textile strap

Premium passport holder in natural-toned leather

Swiftwick Flite XT Mid-Crew Socks Size:M Next-generation optical heart rate andThe Flite XT is the most technologically advanced sock ever developed, providing all around stability. It offers moisture wicking fibers, blister free performance, and medium compression for lasting arch support at any cuff height. AnkleLock Technology GripDry Fiber Made in USA Moisture Wicking Lifetime Performance Guarantee Fabric tech AnkleLock Technology GripDry Fiber CUSHIONING Medium For versatile comfort COMPRESSION Moderate For flexible support