Vaude's Invenio SUL 2P Footprint is constructed from 75D fabric - that's twice the weight of the tent floor and makes for quite a heavy footprint - on the other hand it provides exceptional protection.
Vaude says: Additional tent footprint for protection against mud, thorns and sharp stones.
Vaude's Invenio SUL 3P Footprint is useful if you're going to be pitching your tent on stony ground where there's a risk of abrasion, the GR20 trek on Corsica comes to mind, it will extend the life of your tent but you have to carry it. Made from 75D fabric its more than twice the thickness of the floor fabric in the tent - therefore its designed for extreme protection and not just 'I'll take it in case I need it' - it's 25% to the overall weight of the tent so the weight is a definite consideration.
- Reviewed by Ultralight Outdoor Gear