Abstract: A sheet or blanket construction for end fitting onto a mattress is provided with an expandable end pocket that extends along the width of the sheet and into which the mattress is fitted. An elastic material is incorporated into the edges of the end pocket, and along with integrally formed gathers, provides the necessary expandable characteristics of the pocket. This enables the sheet to be fitted onto commercially sized mattresses, and to tightly enclose the end of the mattress, without slipping out of position. Also, if desired, the sheet edges may be trimmed to a suitable width and then seamed. When users, particularly children, lie under the sheet it will not become dislodged, while providing adequate foot room in the pocket for the user.