groundsheet

A groundsheet, ground cloth, or footprint is a sheet placed on the ground beneath a tent or other shelter to protect the tent floor from moisture, abrasion, and punctures, and to reduce dampness reaching the interior. It may also be used as a simple protective layer for campsites or picnic areas.

In camping, a footprint specifically refers to a groundsheet sized to match or slightly undercut the tent floor; larger tarpaulins or ground cloths can be used for additional protection or improvised shelter. Many tents include an integrated groundsheet or provide a compatible detachable footprint.

Materials vary: lightweight footprints are often made from thin polyethylene or coated nylon; heavier ground sheets use thicker plastic or laminated fabrics. Typical thickness for footprints is around 0.2 to 0.5 millimeters; more rugged ground sheets may be thicker. Some materials are waterproof or water-resistant and offer good tear resistance.

Sizing and fitting: ground sheets are commonly sold in sizes to match standard tent floors or can be cut to fit. For best performance, the sheet should cover the tent floor with a small margin, and edges should not extend beyond the tent to prevent water from running under.

Usage and care: place on dry, clear ground, remove stones, and secure with pegs if needed. After use, clean off dirt, air dry, and store in a dry, breathable bag to prevent mildew.