providing a spring force in the direction indicated by arrow 51 the spring force pushes the weather strip 22 up against the window sash 16 to provide a weather seal to retain the weather strip within the recess 32 the resilient legs 42 and 44 have shoulders 52 and 54 that respectively engage shoulders 56 which are at a forward most position of the recess 32 it will be appreciated that the shoulders 52 and 54 engage the shoulders 56 thereby retaining the weather strip 22 in place when the sealing portion 40 is not in engagement with the sash 16 the resiliency of the legs 42 and 44 permits insertion of the legs into the recess 32 the foam block 46 may be made of any suitable polymeric material such as polyurethane that is formed by processes well known to produce a resilient non rigid foam the sealing portion 40 is constructed of an exterior layer of polymeric material such as polyvinylchloride the portion 40 has an interior 60 that may be filled with a resilient foam or may be left empty the weather strip is typically extruded as one integral piece the jambliner cover 24 has a cover portion 62 that extends from the weather strip 22 to an adjacent sash assembly recess as best illustrated in fig3 the cover portion 62 not only covers a portion of the weather strip recess from view but also an area of the jambliner from the sash assembly recess up to an adjacent weather strip essentially the cover portion 62 is used to cover that portion of the recess 34 that is not engaging a weather strip and those adjacent areas between the weather strip and the sash assembly recess a recess engaging plug.