It’s not about drinking 8 glasses. Your hydration needs are ever-changing and unique to you. Mark One Pryme Vessyl Hydration Tracker tracks your personal hydration needs throughout the day, helping you stay mentally sharp and physically strong. When you are at your Pryme, you are at your best. Connect it to your smartphone and the Pryme app will provide real-time personalized insights and notifications. Made with premium materials: tritan exterior, durable glass interior, polished nickel-plated base. Perfect for both hot and cold water-like beverages.