If your training needs a spark, look no further than the comfort and support of the Nike Elite Spark Merino Wool Cushion No-Show Running Sock. Its super-soft merino wool blend keeps your feet comfortable and warm as you run, while the dynamic arch band delivers gentle midfoot support. A splash zone at the toe helps repel water where it might gather in your shoe, mesh panels boost breathability and comfort, and the left and right specific fit provides ergonomic comfort.