What Makes the SES Ladder Jacket the best option?

Very much unlike other  insulation covers, the SES's Pull Down Ladder Jacket creates an air tight seal around your attic access preventing the loss of energy as well as stopping hot or cold attic air and pollutants from seeping into your house

Typical  covers just sit at the top of your access point, allowing air to pass  into your home. They are not truly sealing your home from energy loss or dust introduction.