This is the Pilz 15 Half Inner. I used it four times as an inner tent for the Tentipi Onyx 9 Light. There is no hydrolysis. You can pull it taut without slack by attaching a carabiner to the rope and pulling from above. The bag's paper tag is coming off as shown in image 5, but this does not affect use. The following is quoted from the official website: ■ Weight Approx. 2.4kg ■ Material Body: Polyester Ground sheet (floor part): Polyester 210d (water pressure resistance 1,800mm) ■ Size Width 420 x 300 x Depth 210 x Height 180cm JANCODE: 4909232350708