The admiral has determined that the 3" thick Tempur memory foam mattress topper we purchased at a local big box store is the best boat investment we have made in many years. She really likes it. It makes for much more comfortable sleeping, and if shes willing to sleep on board more often, it means more sailing for me. We purchased a Queen size topper for use in the V berth of our 1985 Hunter 31. It should install nicely in two pieces, one across the wide end of the berth, another laying lengthwise to cover the narrow end. Right now its just laying in there in one piece. We need to trim it to size. Has anyone ever cut this stuff? Any recomendations on how to trim it? What tools are best?