The IMAK Arthritis Socks can be slept in. Choose size according to your shoe size:
Small fit: Women's shoe 6-8, Men's shoe 5-7.
Medium fit: Women's shoe 8-1/2 to 11-1/2, Men's shoe 7-1/2 to 9-1/2.
Large fit: Women's shoe 12 to 15-1/2, Men's shoe 10 to 14.