The official manikins of the Firefighter Combat Challenge, Simulaids manikins are the best way to maintain the reality of rescue training without using a live subject. Fully articulated, Rescue Randy can be positioned in every conceivable situation. The head and body are built of dense, flexible, life-like vinyl that is rugged and waterproof. The 18.7 kN (4,200 lbf) breaking strength stainless steel cables are coated. Rescue Randy has been designed to be a realistic 6 foot 1 inch (183 cm) tall manikin. I.A.F.F. Rescue Randy has additional reinforcement for even greater durability. Rescue Jennifer is 4 feet (122 cm) tall, equivalent to a 7- to 12-year-old child. The Water Rescue Randy was developed for YMCA water safety courses and allows adjustment to its buoyancy by adding weight to the abdomen. It weighs 40 lb (18 kg) on dry land but will sink with about 10 lb (4.5 kg) added weight.