The OS1st Bunion Relief Sock Black sock provides relief and added comfort for your bunions. The BR4 technology uses four targeted compression zones to support your foot and improve circulation. The seamless construction reduces blistering caused by hotspots is an added benefit. It includes split toe that helps reduce friction, extra padding over bunion for pain relief and targeted compression provides a secure fit and proper circulation. The left and right foot anatomical shape provides form fitted feel. It is made of 82% nylon and 18% Lycra Spandex.