Fits Trail 21+ and Trail 21+ Triple Tough tent in 1P+ mode and sized slightly smaller than the tent floor to prevent water pooling. Helps extend tent floor life by reducing the normal wear and tear from wet and/or abrasive sharp ground. Also, designed to be used independently in fly-footprint mode with stakes and poles. Color coded to 3P tent floor with quick connect buckles. Ripstop nylon. (Fly, poles not included).