Prepare a heavy-duty staple gun and silicon sealant as you will be needing them on installing the ThermoClimb.
Take out ThermoClimb from the bag and measure the dimensions of the stairs and attic door.
Lay your ThermoClimb around the frame of the attic stairs. Ensure that the zipper ends where you enter into the attic. Use the staple gun to secure the bottom of the edges against the frame.
Adjust the Velcro straps on the outside of the ThermoClimb so it can snugly fit against and around the frame. Staple the cover flatly to keep the air from going out.
Apply a bead of silicon sealant along the gaps as close as you can to the stapled foot.