◉ Cervical Collar - Collar Keeper, Size S Purchased a supporter at the hospital due to neck pain from a sprain. It provides firm support for the neck and reduced the pain. Used for about 5 days while traveling on trains and bullet trains. Washable, so it has been home-cleaned. COLLAR KEEPER, Size S [I tried on a Collar Keeper size M (for women), but it didn't fit, so I chose size S. I've included the size chart from the instructions for reference.] Thank you for viewing.