Sandwich breads are produced in many varieties, such as white, whole wheat, sourdough, rye, multigrain and others. Sandwich bread may be formulated to slice easily,[8] cleanly or uniformly, and may have a fine crumb (the soft, inner part of bread) and a light texture.[4] Sandwich bread may be designed to have a balanced proportion of crumb and crust, whereby the bread holds and supports fillings in place and reduces drips and messiness. Some may be designed to not become crumbly, hardened, dried or have too squishy a texture.