Abstract: The presented invention is a bump cap. The bump cap has a hinged rear section that pivots away from the body of the bump cap to allow hair or other headwear to leave the bump cap. The bump cap insert is ventilated and adjustable through trim notches and flex joints to accommodate various heads shapes and hair styles.

Abstract: The presented invention is a durag with an enclosure in its crown configured to accept a bump cap insert. The durag has a hair shoot in the back portion that allows long hair or other headwear to be funneled away from the durag for comfort and security. The bump cap insert has a hinged rear section that allows hair or other headwear to leave the bump cap and the durag and allowed to be funneled down the hair shoot of the durag. The bump cap insert is ventilated and adjustable through trim notches and flex joints to accommodate various heads shapes and hair styles.

Abstract: A bump cap foam insert for a hat that uses tab and slot structures to form the insert in to a generally conical shape to fit into a hat. The foam insert is constructed by the use of vented radial extensions that extend from a common center and that have a density of about 4 pounds per cubic foot, a thickness of about 0.16? and a tensile strength of about 90 psi.

Abstract: The use of polyol having a functionality of 4 or less and an OH group density of at least 0.033 mol OH per g polyol as a composition for reducing shrinking of construction chemicals on the basis of a hydraulic binder comprising a) alumina cement and/or calcium sulfoaluminate cement, b) calcium sulfate, and c) optionally Portland cement.

Abstract: A bump cap foam insert for a hat that uses tab and slot structures to form the insert in to a generally conical shape to fit into a hat. The foam insert is constructed by the use of vented radial extensions that extend from a common center and that have a density of about 4 pounds per cubic foot, a thickness of about 0.16? and a tensile strength of about 90 psi.