The Fitted Sheet is the first accessory that I would recommend for use with any Therm-a-Rest. Out of a package this big you get a sheet that is going to cover your Thermarest, provide addition slip resistance, give you a way for the mattress to feel softer and quieter, has slip resistant band on the bottom so that it doesn’t slide around on your tent, and most importantly it has snaps that can either allow two Therm-a-Rests to be mated together or more importantly allow the use of a Ventra Down Blanket or a Tech Blanket.