Range Systems has developed a range of passive thermal targets for training with night vision equipment. The targets reflect heat from the atmosphere and so do not need an external heat source.

From the press release …

Range Systems, a leading manufacturer of live fire shooting products for the military, law enforcement and consumer communities, introduces their new line of ThermBright passive thermal targets.

ThermBright targets utilize a proprietary advanced coating process that effectively reflects the cold energy of space when tilted backwards by 10 degrees. Using any in-service sights including image intensifiers and Fusion sights, the targets work effectively in daylight or at night, and will work in all weather conditions. Because they do not require any power source or batteries, they are safer than heat-activated alternative targets, are logistically easier to use, and far more economical. The sturdy construction of ThermBright targets will endure 2,000 rounds of small arm fire before thermal degradation begins to occur.

Currently, ThermBright Passive Thermal Targets are offered in training styles ranging from soldiers, armed insurgents, tanks, armored personnel carriers, and other vehicles, as well as target patches, marking panels and several animal images. MSRP ranges from $35.00 to $600.00.