Analogue Works set out to make an inexpensive turntable mat that offered a huge sonic upgrade over the standard felt mat originally included with the turntable. We listened to every available extruded material known to mankind (even cheese was tested at one point) ultimately leading to the four materials now offered. Cork and Nitrile Lite, Cork and Nitrile Heavy, Silicone and Neoprene.
If you own any turntable with a removable mat you have to try the Analogue Works GimpMat's. You will hear a reduction in background noise, cleaner crisper and more delicate sound, together with a wider deeper soundstage and greater bass authority.