uniquely designed it can let your neck,head,shoulder and back more comfortable Can cure insomnia produce kinds of sizes Test item Unit Test method Actual number Tensile Mpa GB/T 528-1998 1.46 Elongation % GB/T 528-1998 240 After the hot air gets older (100*48h) / GB/T 3512-2001 / Elongation % / +14 Density kg/m3 GB/T 533-1991 (127-133 kg/m3) 130.8 25% compression degree of hardness Kpa SAEJ18 25mm/min 5% 50.8 Water-absorptivity % SAEJ18 0.63 Bears the ozone aging experiment / GB/T 7762-2003 O (50*10-8, stretch 20%,40*48h) / / / Test result ok The information about product-related for reference only,but not about parameters of finished products !