An improved subsea wellhead seal assembly includes an annular body 28 having a pair of lower annular skirts 32, 34, one 32 extending downwardly and outwardly and the other 34 extending downwardly and inwardly, a lower landing ring 50 and means 62 movably securing the lower landing ring to the annular body so that, when the lower landing ring is landed, the annular body continues its downward movement to deform the annular skirts outwardly and inwardly into sealing engagement with the walls of the annulus. A reaction ring 56 is provided landing ring for engagement by the ends of skirts and spacer rings 52 may be used to preselect the level of the sealing surface engagement by the skirts.
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