Therma-Tru 2/Pkg Fiber-Classic/Smooth-Star Tru Defense Corner Seal Pad (WHITE) Genuine Therma-Tru corner seal pads (inswing only) complete the seal between the sill cap, bottom sweep and weatherstrip to help block potential pathways where wind-driven moisture can infiltrate the bottom corner of the door system. Fit securely behind the weatherstrip to help block wind-driven moisture infiltration. Designed to mate with inswing sills to complement weathersealing performance. (Not required for outswing sills.) Flexible, foam-filled material holds its shape over time, protected by a durable jacket to resist moisture and wear.