1 x 3mm PERFORATED Grey Poron Sheet|Comfort|Support|Absorption|Flexi|XS|S|M|L|XL por | ago 4, 20261 x Grey Poron Sheet|100cm x 45cm|Large Sheet Size|High Performance Urethane Grey Poron 4000 3 Thicknesses: 1.6mm / 3mm / 6mm – ONE Large Sheet: 100cm x 45cm. Grey Poron 4000 A durable high performance urethane with excellent shock absorption properties.