An approved dynamic construction effectively thermally insulates and seals a safing slot between a floor of a building and an exterior wall construction, wherein the exterior wall construction includes a curtain wall configuration defined by an interior wall surface. The dynamic, thermally insulating and sealing system includes a tubular sealing element having wing-like connection areas for attaching the tubular sealing element to the curtain wall construction and the floor of a building, to maintain thermally insulating and sealing of the safing slot during exposure to fire and heat as well as movement in order to maintain a complete seal extending across the safing slot and to enhance the water-stopping properties of the insulation and seal within the safing slot.