Mainline ISO Sweet Shelf Life Boilies are part of the Mainline Baits range of dedicated freezer bait and shelf-life boilies. The ISO Fish bait draws on over thirty years of bait making research, testing and knowledge to bring the modern-day angler a food-source boilie. It uses a unique blend of complex fishmeals and nutritional ingredients, resulting in a highly palatable and digestible boilie that releases an attractive flavour as soon as it hits the water, for both instant and long-term results.