For gaps that don’t need a thick seal, this black non-ribbed D-seal fits the bill. Measuring 1/2-inch by 3/8-inch in profile, it’s small enough for window trim but thick enough to block air movement. Self-adhesive backing means no clamps or fasteners. One 50-foot roll seals multiple smaller openings.

• 50 ft. × 1/2 in. × 3/8 in.
• Non-ribbed D-seal, black foam
• PSA backing, made in USA
• 1-year warranty