Essential nutrients refers to classes of nutrients found in food. Essential nutrients are simply those that are vital for the normal growth, maintenance and development of the body. There might be a slight confusion about essential nutrients that must be addressed.
Definition of waterproof for English Language Learners. : 1  designed to prevent water from entering or passing through. : 2  designed so that water alone will not remove it.
Waterproof jackets (or hard shells as they are also known) are the final protective layer in your layering system. This layer provides a waterproof barrier. The main difference between these waterproof layers is the fabric they are made from and the level of breathability that this will give you.