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With a carbon neutrality horizon in 2050 as target for the industry, the use of growing quantities of recycled and recyclable materials is key. “Greenflocks” chips urethane based poroelastic material coming from recycled PU mattresses, that are decontaminated, shredded, mixed with thermoplastic bi-component PET fibers as well as thermofixed with hot air ovens resulting in low Volatile Organic Component (VOC) and odors, seems to be a good candidate. Indeed, one gets a 80 % recycled poroelastic material, 100% recyclable, with mechanical and acoustical properties allowing between 10 % and 20 % weight reduction compared to shoddy cotton felt typically depending on the density. Indeed, this “Greenflocks” material presents excellent mechanical decoupling properties even at high densities for the low thickness areas above 150 kg/m3 and up to 300 kg/m3 typically with a Young’s modulus kept below 150 kPa.