A footprint is incredibly useful firstly when you arrive at the campsite you can use it to mark out your intended pitching position to make pitching your tent quicker & easier & then when you come to pack up your tent you will find that the footprint has kept the groundsheet of your tent clean & protected from sharp objects So if you have a Vango Langley 600 Tent then it is a great idea to also invest in a Vango Langley 600 Footprint Extension as it has been designed to fit underneath the Langley 600 Tent & extension perfectly