Regular cloak with Continual Freeze cast on it
Lenwe Aldarion is the first known to pioneer this item by simply laying out cloaks in the freezing north and then casting the spell Continual Freeze on them. The cloaks are none the worse for wear, perhaps just a little stiff. Cloaks enchanted thus have vastly improved insulating properties. They also go a long way toward masking infravision signatures. Note, however, they are not “invisible” to infravision. Rather they appear cold (dark to infravision). In many circumstances this is effectively invisible, but should the wearer be in a hot ambient or be backlit by a strong heat source, then the character would cast a shadow perceivable by an infravision endowed observer. Of course observers might not fully understand what they are seeing until it is too late.