Hard PolyU Foam for Insole: 1)high density, hard 2)antibacterial, odor ... of ventilation, sweat-absorbing, soft, no distortion, anti-mildew, anti bacteria and anti smell… Now, it’s popular to all-known ... but that its special advantages. 2.Hard PolyU Foam for Insole:Physical CharacteristicsDensity(kg/m3)220 — 240Hardness(asker c ... of cushions, knapsack belts etc. Hard PolyU Foam for Insole Hard PolyU Foam ...