You’ve got a few good options, depending on where you place them.

• Under the tent (outside): Use a tent footprint, groundsheet, or camping tarp. Pick one slightly smaller than your tent’s base to help prevent rain from pooling.
• Inside the tent: Add comfort with a tent carpet/rug, interlocking foam tiles, or a soft floor liner. They can add warmth, reduce slipping, and protect the built-in floor.

Before laying anything down, clear sharp sticks and stones. None of these layers are puncture-proof, so choosing the right thickness and material for your terrain can help extend your tent floor’s life.

Several flooring types offer waterproof protection, each with trade-offs:

• Polyethylene (PE) groundsheets: Tough, budget-friendly, and reliably waterproof for car camping or basecamps.
• PU-coated polyester/nylon footprints: Lightweight and packable with waterproof ratings (often noted as PU 3000 mm or higher). Great for backpacking.
• PVC tarps: Highly water-resistant and easy to wipe clean, but heavier and bulkier.
• Aluminum-foil insulation mats: Add a water-resistant barrier and thermal reflection under or inside the tent.

Waterproof performance can vary by thickness, coating, and condition. Checking product specs and matching the material to your campsite (rocky vs. soft ground) can help you get the protection you want.

Both can work well, but they feel and pack differently:

• PE (polyethylene): Durable and abrasion-resistant with dependable waterproofing. It’s a solid choice under a tent as a groundsheet. It tends to be lighter and less bulky than PVC options of similar toughness.
• PVC (polyvinyl chloride): Very water-resistant and easy to wipe clean. It’s generally heavier and can be stiffer in cold weather, which may affect packability.

If you’re backpacking, a lighter PE or PU-coated fabric footprint is typically easier to carry. For drive-in sites or longer stays, PVC-style mats can offer sturdy, easy-clean flooring. Matching material to your trip style is the key.

You’ll see a few names that refer to similar items:

• Tent footprint: A fitted or sized sheet that sits under your tent to protect the floor.
• Groundsheet/ground cloth: A general protective layer used under tents, shelters, or tarps.
• Tent floor saver: A protective sheet marketed to reduce wear and abrasions on the tent base.
• Camping tarp: A versatile sheet that can work under a tent, as a picnic mat, or as a simple shelter.
• Tent carpet/rug: A softer liner that sits inside the tent for comfort and warmth.

The right term usually depends on whether it’s used under or inside the tent.

A good rule is to size the footprint just inside your tent’s outline.

• Measure your tent floor (length and width) from the manufacturer’s specs.
• Choose a footprint slightly smaller than the tent base so edges don’t stick out and collect rainwater.
• Match the shape: Rectangular, hexagonal, octagonal, and model-specific footprints fit differently; pick the one that follows your tent’s floor plan.
• For pop-up shelters or wall tents, look for compatible floor panels sized to their side lengths.
• Trim only if intended: Some soft carpets or liners are cuttable; coated tarps typically aren’t.

This approach can help protect your tent without creating water pooling in wet weather.