Similarly, classic riders are obliged to wear white bibs. They have black bibs, orangish forehead patches and two light-coloured stripes on each wing. This special sacred bull had dozens of servants and wore precious crowns and bibs. Bibs could be added to permit breastfeeding. Some runners weigh themselves before running and write the results on their bibs. Chambers with BIBS will generally have an oxygen monitor. The same principle is used in a diving chamber's built-in breathing system (BIBS).