By popular request, I am now selling the battle mat grippers I use under the Deep-Cut cloth mats I use with my participation games at shows – if you have gamed with me, you have gamed on these!
A battle mat gripper provides an excellent underlay for use with the Deep-Cut cloth mats. Slightly tacky, the gridded material prevents the cloth mats from sliding or bunching during play. Each gripper weighs around the same as the equivalent-sized mat (typically less than 0.5kg) and, when not in use, it can be folded up and stored in a bag.
As well as preventing slippage, the gripper underlay is slightly "springy" and provides a comfortable surface to game upon. When used with a cloth mat, it gives a similar effect to gaming on a mouse mat – even better, a battle-mat-and-gripper combination weighs only around a quarter of the weight of the equivalent mouse mat, and so is much easier to transport and store.
Battle mat grippers (along with the mats they are used) can be found in the BigRedBatShop.