Helinox Protective Ground Sheet Accessory for Camp Chairs. Key Features: Ground sheet camping chair accessory for leveling the load and preventing sinking into soft or uneven ground. Compatible with Chair One, increases comfort and stability in rugged conditions, especially sand and muddy ground. Easy-to-attach, a center strap secures the sheet to the chair frame, while chair feet slide into corner pockets. Chair One ground sheet measures 16 x 15.5 inches open, and weighs 4 ounces; manufacturer’s five-year warranty. Free & Fast Shipping: Free shipping to most of the USA with delivery time of 3-7 days. Shipping Restrictions: Contact us for restrictions. Return Policy: 30-day hassle-free returns for a full refund or exchange. No restocking fees. Refunds processed within 1 business day.