1. Advanced Door Draft Stopperly upgraded bottom integrated flocking door draft stopper. Its double layer design significantly strengthens the clamping edge. Made from high quality soft materials. The corrugated bottom is ingeniously designed to minimize friction with the ground, ensuring smooth movement. 2. One Step Effortless InstallationUnder Door draft stopper is tailor made for smooth indoor floors. Installation is easy. Just open both sides and push it directly along the gap at the bottom of the door. Then, trim off the excess part. (In cases where the door gap is relatively large, you can make use of the auxiliary glue provided.) 3. Energy Saving PioneerOur door draft stopper functions as an outstanding draft blocking solution. It effectively bridges the heat gaps, leading to significant energy savings. Moreover, it doubles as an excellent sound insulation device! With this versatile door insulation strip, you can substantially enhance the energy efficiency of your home. 4. CautionThis draft stopper for doors is suitable for flat ground surfaces without a threshold. It is designed to fit door bottom gaps ranging from 0.15 to 0.59 inches and door thicknesses between 1.37 and 1.96 inches. The product has a length of 39.37 inches. Please accurately measure the length and thickness of your door before installation. (Note: It is not suitable for concrete floors, anti theft doors, or uneven floors.)