Sea To Summit Reactor Thermolite Liner (adds up to 14°F) | Mummy | Black 2 Gallon Groundsheet: 210T 100% nylon with

Groundsheet: 210T 100% nylon with (8000mm HH) waterproof polyurethane coating

We know that in the backcountry

Since it’s credit card size

Please check and replace the O-ring regularly to maintain the waterproof rating

Walls: Ripstop nylon 15D

Sea To Summit Reactor Thermolite Liner (adds up to 14°F) | Mummy | Black 2 Gallon Groundsheet: 210T 100% nylon withThe THERMOLITE Reactor liner is our top selling and lightest thermal sleeping bag liner. It's an excellent cold weather option for those who need additional warmth. The hollow core fibers trap heat and offer extraordinary insulating properties. This is a super stretchy, soft, and comfortable choice with a mummy shape, foot box and a drawcord hood. Compact and lighter weight than fleece, this is a best seller for good reason. Features Traps insulating