MED-TAC International's Emergency Blankets collection covers patient warming and hypothermia prevention: mylar emergency blankets, hypothermia wraps, wool blankets, heat-reflective patient covers, and active warming systems. Preventing hypothermia is the "H" in the MARCH algorithm and a direct intervention against the lethal triad — stocked for tactical medics, EMS, wilderness responders, and prepared civilians who understand that cold kills trauma patients as surely as hemorrhage.
Hypothermia — core body temperature below 35°C (95°F) — is one of the three components of the "lethal triad" in trauma, alongside acidosis and coagulopathy. In hemorrhagic shock, the body sacrifices peripheral circulation to maintain core perfusion, accelerating heat loss. Coagulation enzyme activity falls precipitously with temperature: at 33°C, clotting function decreases by approximately 50%; below 32°C, coagulopathy can become refractory. A hypothermic, coagulopathic, acidotic trauma patient enters a self-reinforcing physiological death spiral that resuscitation cannot reverse in the field. The MARCH algorithm (Massive hemorrhage, Airway, Respirations, Circulation, Hypothermia) places hypothermia prevention as the fifth priority precisely because it becomes the limiting factor for survival after initial hemorrhage control. The Joint Trauma System Clinical Practice Guidelines on hypothermia prevention are clear: prevent heat loss from the moment of initial patient contact. Every trauma kit — military or civilian — should contain at minimum one emergency blanket or hypothermia wrap.
| Type | Heat Retention Mechanism | Packed Size/Weight | Best Application |
|---|---|---|---|
| Mylar Emergency Blanket | Reflective metallic film reflects up to 90% radiant body heat | Ultra-compact — fits in IFAK or pocket | Individual IFAK, field trauma, search and rescue |
| Hypothermia Wrap / Heat Sheet | Multi-layer insulation + vapor barrier; active or passive | Moderate — folds to bag size | Severe hypothermia, prolonged field care, patient packaging |
| Wool / Military Blanket | Insulation through trapped air in wool fibers; retains warmth when wet | Bulky — for vehicle or aid station staging | Aid station, vehicle-staged trauma kits, prolonged care |
| Active Warming Systems | Chemical heat packets, electric heating elements | Variable — chemical packs are compact | Prolonged field care, hypothermic arrest prevention |
Effective patient warming in the field follows a simple protocol: (1) remove wet clothing if operationally feasible — wet fabric conducts heat away from the body up to 25 times faster than dry fabric; (2) place insulation beneath the patient, not just above — ground contact causes the greatest conductive heat loss; (3) wrap the mylar emergency blanket or hypothermia wrap with the reflective surface facing inward toward the patient; (4) cover the head — up to 40–50% of heat loss occurs through an uncovered head; (5) layer additional insulation if available. For hypothermia wraps with vapor barrier functionality, seal the wrap to trap air and prevent convective losses. In prolonged field care or extended extraction scenarios, add chemical heat packets to the axillae and groin — high-vascularity zones where surface warming is most effective. The MARCH algorithm places hypothermia prevention last in priority but first in time — begin warming as soon as hemorrhage is controlled.
The lethal triad — hypothermia, acidosis, and coagulopathy — describes the three interacting physiological derangements that kill hemorrhagic trauma patients when unchecked. Hypothermia directly impairs the coagulation cascade, worsening coagulopathy. Worsening coagulopathy causes continued hemorrhage, deepening shock and acidosis. Deepening acidosis further impairs cardiac function and coagulation. Breaking this cycle requires simultaneous intervention on all three components: hemorrhage control addresses the coagulopathy source, resuscitation addresses acidosis, and emergency blankets and patient warming prevent and reverse hypothermia. A mylar blanket costs a fraction of a dollar but can be the intervention that keeps a trauma patient's coagulation system functional long enough for surgical intervention. Every IFAK, EMS bag, and trauma kit should contain at minimum one emergency blanket. Browse companion warming supplies in the Head Injuries & Hypothermia Prevention collection.
Close the Gap on the Lethal Triad
Mylar blankets, hypothermia wraps, wool blankets — lightweight protection against the H in MARCH.
All products sourced from the actual brand manufacturer or authorized master distributors. CoTCCC recommendation status verified where applicable. Ships from MED-TAC International, Pembroke Pines, FL — clinician-founded, veteran-led, SDVOSB-certified.
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