A cap assembly for encapsulating a fastener protruding from a surface and terminating at a distal end, the cap assembly comprising: a plurality of nested sections (36, 51, 52, 38) that telescope from a collapsed configuration to an extended configuration, the plurality of nested sections comprising a base section comprising a base rim that can engage the surface in the extended configuration, the plurality of nested sections further comprising an end section that comprises an end wall, wherein the end wall and base rim may define a length of the cap assembly in the extended configuration that is sufficient to encapsulate the fastener within the cap assembly with the base rim engaging the surface and the end wall spaced apart from the distal end of the fastener, wherein each of the nested sections (36, 51, 52, 38) has a large end (54, 55, 56, 57) and a small end (61, 62, 63, 64), the small end of the end section being connected to the end wall, wherein, except the small end of the end section and the large end of the base section 36), an interior surface of the small end of each nested section engages an exterior surface of the large end of a successive nested section thereby limiting extension of the cap assembly in the extended configuration, wherein the end wall and the small ends (62, 63, 64) of the other nested sections (51, 52) except the base section each comprise a radially outward extending member (71, 72, 73) that engages the small end of a successive nested section upon collapse of the cap assembly to the collapsed configuration to positively capture the nested sections (36, 51, 52, 38) within one another when the cap assembly is in the collapsed configuration. a plurality of nested sections (36, 51, 52, 38) that telescope from a collapsed configuration to an extended configuration, the plurality of nested sections comprising a base section comprising a base rim that can engage the surface in the extended configuration, the plurality of nested sections further comprising an end section that comprises an end wall, wherein the end wall and base rim may define a length of the cap assembly in the extended configuration that is sufficient to encapsulate the fastener within the cap assembly with the base rim engaging the surface and the end wall spaced apart from the distal end of the fastener, wherein each of the nested sections (36, 51, 52, 38) has a large end (54, 55, 56, 57) and a small end (61, 62, 63, 64), the small end of the end section being connected to the end wall, wherein, except the small end of the end section and the large end of the base section 36), an interior surface of the small end of each nested section engages an exterior surface of the large end of a successive nested section thereby limiting extension of the cap assembly in the extended configuration, wherein the end wall and the small ends (62, 63, 64) of the other nested sections (51, 52) except the base section each comprise a radially outward extending member (71, 72, 73) that engages the small end of a successive nested section upon collapse of the cap assembly to the collapsed configuration to positively capture the nested sections (36, 51, 52, 38) within one another when the cap assembly is in the collapsed configuration.