GU Roctane Ultra Endurance Energy Gel is a high-intensity offering from GU, the original sports energy gel. It is designed for extreme and long-duration endurance activities and comes in highly compact, portable, and calorie-dense packets loaded with rapid-absorbing fuel. Athletes performing at a high level for hours on end need more from their nutrition, which is why Roctane Energy Gel packs three-times the amino acids and twice the sodium as original GU Energy Gel.