US Patent 9629397 Articles of apparel including auxetic materials

An article of apparel includes a base layer and an auxetic layer. The base layer includes a four way stretch material. The auxetic layer is coupled to the base layer and includes an auxetic structure defining a repeating pattern of voids. In accordance with one exemplary embodiment of the disclosure, each void has a reentrant shape and is at least partially filled with a foam or a hot melt material.