Features: Kirkland Signature Pack contains: (4) Black, (2) Natural Full cushion with durable reinforced heel and toe Arch support for superior fit Smooth finish toe seam Moisture wicking Repreve recycled nylon Made in the USA Content: 57% Merino Wool | 40% Nylon | 3% Spandex Sizing: Fits men's shoe size 7-13 Care Instructions: Turn inside out Machine wash warm Use non-chlorine bleach as needed Tumble dry low Do not iron Do not dry-clean