Abstract: A slidable door structure adapted to move on tracks wherein one or more glide assemblies are used to resiliently mount the door. The glide assembly includes a glide body and a retention member with a spring means disposed between the two bodies. A snap fastener serves to hold the glide assembly in position so that the retention member is maintained in a fixed position while the glide body moves vertically relative to the door structure. The invention also includes an improved mullion structure and a locking device for locking and maintaining the door in an open position. Further, a substantially leak-free connection is provided between the door and wall jamb.