21st Birthday gift, Anniversary gift, perfect for a 21 years completion of a friend, sister, mother, father, grandparents, colleague, boss. Material: 5% Spandex, 15% Cotton, 80% Polyester Simply The Best 21st Socks for Daily Wearing or Wedding Party, Opening Ceremony, Anniversary Celebration, Graduation, Sports, Travel Commemoration, Business Gifts, Employee Benefits, Holiday gifts and so on. One Size Fits to all ( UK 4-11 ).Machine Wash. Great novelty gift for a 21st birthday. Let your loved one know that they are simply the best!