Alien Seal is the innovative, transparent, flexible tape that seals gaps around windows and doors in a flash. Just measure, cut to size, peel the backing, and stick it right into place. The secret is the flex-flap technology that snaps into place to create an airtight seal, blocking out dust, wind, rain and drafty air. Alien Seal helps lock in a constant temperature for your home so it can stay warm or cool. And it's weatherproof too, so it maintains a perfect seal on exterior windows, doors or unfinished spaces. Alien Seal is also water resistant, so those leaky shower doors can be sealed in minutes too.