AceCamp 3940 Portable Lightweight Mini Waterproof Folding Mat

From the Amazon Listing

• LIGHTWEIGHT MATERIAL - This ultralight foam kneeling and seat pad protects your rear and knees against rocky terrain. Kneeling on rocky terrain hurts, but not if you use our comfortable portable pad.
• COMPACT & PORTABLE DESIGN - When unfolded, it is about 15.75x12x.5 inches. When folded it is about 12.1x4.1x2 inches. The whole seat cushion weighs only 1.6 ounces.
• WATERPROOF - With a waterproof and moisture-proof design, this foldable pad is perfect for outdoor activities. Whether you are camping, hiking, backpacking, hunting, fishing, or just need to rest or sit, this mini cushion mat can always be on hand.
• GREAT QUALITY - This camping foam pad is very well made and very convenient. Both the red and black sides can be used. It is very durable and can last a long time.
• NEVER LEAVE COMFORT BEHIND - Since this portable folding mat can be folded into such a small package, you can almost always take it with you. Now you can have a comfortable sitting pad with you on almost any occasion.