A thermal protective aid (TPA) is an aluminized polyethylene suit with heat sealed seams that protects from the elements and prevents hypothermia.
It is defined by the International Life-Saving Appliance (LSA) Code as follows:
Every survival craft should have 2 thermal protective aid suits or 10% of its total carrying capacity whichever is greater.Thermal Protective Aid – Requirements as per SOLAS For the purpose of high visibility in all weather conditions the suit is coloured in international orange. Thermal Protective Aid (TPA) and Immersion suits
Some manufacturers currently construct suits with discrete size bands (XS–XXL) and others of a single ‘universal’ size.MarED Doc-ID 15-541r10 Q LSA 073 200217 Due to its usage conditions it should be suitable to be worn over bulky clothing and lifejacket.SOLAS approved Thermal Protective Aid (TPA)
See also Immersion suit Space blanket
References