We’ve added a HOT new feature to our flagship protein: heat stability. This limited-edition variety is made with pure, fast-acting 100% whey hydrolysate. Specially designed to withstand mixing temperatures ranging from boiling to freezing, this R1 Protein is equally enjoyable served hot or cold. For an extra anytime-energy boost, try the Bold Brew Coffee flavor. Made with real coffee bean extract, each serving provides about 100mg of natural-source caffeine.