- Materials: 80% cotton | 18% nylon | 2% lycra/spandex - Sizing: One Size Fits Most - Officially Licensed with the University of California, Berkeley - Care Instructions: Machine Wash Showcase your school spirit and add a stylish touch to any outfit. These Timeless Tartans socks are destined to become a staple of your wardrobe. Timeless Tartans' patented algorithm combines Cal's founding year and campus coordinates with its official colors to create a unique, meaningful pattern that will stand the test of time.