Stash Socks! Zipper pocket socks to keep things secure and hidden. Pocket is large enough to hold credit card and other valuables. Will not hold passports. Pair comes with one regular sock and one sock with a zippered pocket. Metal Detectors will not be set off by Pocket Socks zippers. Fits US mens shoe size 8 - 12.5 Fits US womens shoe 9 - 13 Machine Wash Warm. Tumble Dry Low to Medium. Do Not Bleach. Great for travel, hikes, and concerts!