1.50D Nylon TPUThis selfinflating camping mat is made of 50D nylon material with a waterproof TPU coating. 50D nylon is a tearresistant, punctureresistant, and waterproof material without odor. The environmentally friendly TPU layer under the fabric effectively prevents air loss. It is waterproof and insulating. 2.Ergonomic Design – More ComfortThe sleeping mat features an ergonomic design with an integrated pillow. A 10 cm thick padding layer provides mattresslike support, distributes body pressure, and effectively protects the spine, thereby alleviating back pain and allowing you to sleep comfortably. 3.The camping sleeping pad comes with an improved builtin foot pump. Full inflation takes only 30–50 seconds by stepping on it, so you don't need to blow air with your mouth or carry a pump. It can be deflated in just 3 seconds. The deflation valve features a leakproof doublelayer valve design to prevent air loss. 4.Unique Connectable DesignOur inflatable camping mattress is resistant to punctures from sharp objects like stones and branches. Both sides are equipped with connectors, allowing two mattresses to be joined into a double bed, providing more space and making it the perfect companion for group trips.