Endura Gel Box 20 Endura Sports Energy Gels are a concentrated energy source, containing a combination of two specialised forms of carbohydrates to increase total carb absorption from 60 g to 90 g an hour. Each gel contains 26 g of carbs with energy boosting caffeine. Store them on you during training and racing to conveniently keep glycogen levels up, maintain vital energy reserves and prevent hitting the wall. Buy in bulk and save! Mix and match or single flavour 20 serve boxes.