Sheep Wool Insulation SilentWool Carpet UnderlayThe Sheep Wool Insulation SilentWool 100% pure wool underlay for carpets is part of a range of sound proofing and insulation products made of pure wool. The pure wool underlay is 9mm thick, and comes in rolls 1m wide and 10m long. This product acts as an effective carpet underlay due to its luxurious texture and qualities. The carpet underlay is made entirely of wool without any carrier material so it gives a lovely bounce as you walk on it alongside