Conventional sock wisdom dictates that you can either have padding for protection and comfort, or two layers for reduced friction. Padded socks are thick, double layer socks are thin. The 1000 Mile Fusion Sock breaks that mould with innovative design and material technology to provide a sock that offers everything: the 1000 Mile double layer sock’s blister-free guarantee, but with padded comfort and protection, including full-length achilles tendon padding.The black version features a longer leg for trail and off-road running, so is also suited for winter use.