Review on Emergency Survival Mylar Thermal Sleeping by Jason Wright

For maximum warmth in cold weather, the opening requires either a bungee cord closure or multiple Velcro straps to remain closed during use. For noise reduction, consider a light mesh or mat on one side, which can reduce reflectivity a bit but reduce noise during use. In some situations, avoiding hypothermia is important, but getting enough sleep to think clearly is crucial in all situations, especially those that last longer. Many rescue operations are not possible for several days.