Scientific studies show that sitting, driving, varicocele, and high BMI overheat the testicles and reduce sperm count and quality. The Underdog is a patented cooling device designed to optimize testicular temperature and prevent overheating. It uses a wedge-shaped insulated cooling pack that you sit on, and it uses scientifically engineered insulation to achieve optimal cooling. Use The Underdog whenever sitting for longer than 20 minutes. Each pack lasts 4 hours. A spare pack allows all-day cooling e.g. at the office or professional driver. Optimize your sperm production with cooling science today. Because sperm quality matters, and your kids are worth it.