This video demonstrates how closed cell camping mats can be used to affordably insulate a V-berth or similar area. This type of matting is widely available and can provide a good level of basic insulation. The advantage of closed cell is that the matting is thin and doesn’t majorly reduce the amount of room in a v-berth or other enclosed space. Notably, it is important to choose closed cell foam to stop the foam taking on water whilst providing emergency buoyancy. Camping mats work by providing a layer of insulation between the ground and your body. This is what makes them ideal for DIY insulation use.