Keeps warm or cool air inside, lowering heating and cooling waste: the double underdoor draft stopper blocks cold air, wind and drafts so your HVAC system works more efficiently and can help reduce energy costs. Doublesided protection: the draft stopper seals both sides of the door opening to reduce light, noise, odors and drafts for a more comfortable room. Moves with the door: designed to glide smoothly across carpet, wood, tile and linoleum so it stays in place as the door opens and closes—no bending down to reposition. Flexible, fit: cut the stopper to size for use on windows or nonstandard door gaps. The flexible material conforms to irregular gaps and creates a tight seal. Key features Function: blocks drafts, wind, light, noise and smells while improving room insulation. Compatibility: fits most underdoor applications and can be trimmed to suit window sills or nonstandard openings. Material and performance: flexible construction forms to gaps for an effective seal and allows smooth sliding across common floor surfaces. Installation: simple — slide under the door and trim to length where needed; no tools or hardware required. Practical use scenarios 1. Front or back doors: install under exterior doors to reduce cold wind and drafts entering the home, improving comfort and lowering heating bills. 2. Bedroom or home office: block hallway light and reduce noise transfer for better sleep and concentration without needing to reposition the stopper. 3. Windows and sliding doors: cut to size and press into window gaps or along sliding doors to seal out drafts and odors during seasonal temperature changes. Care and maintenance Wipe clean with a damp cloth. Trim with scissors to adjust length as needed. Repositioning is rarely required thanks to the gliding design. This draft stopper offers a simple, loweffort way to improve insulation, reduce unwanted air and noise transfer, and increase comfort in multiple home applications.