Ice Cold Water Immersion Kit I-CWIK
The Problem: Exertional Heat Illness (EHI)
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Leading cause of preventable death in sport, endurance events, and physically demanding workplaces.
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Rapid onset: Core body temperature can rise above 40°C within minutes, leading to heat stroke, organ failure, and death if not managed immediately.
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Time-critical: Evidence shows that survival and outcomes depend on reducing body temperature to safe levels within the first 30 minutes (“cool first, transport second”).
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Current challenges:
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Traditional cold water immersion tanks are bulky, heavy, and location-dependent.
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Access to effective cooling is often limited in remote, resource-constrained, or mobile environments (sports fields, mine sites, military operations).
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Alternatives like ice packs or misting are slower and less effective than whole-body immersion.
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The Solution:
I-CWIK – Instant Cold Water Immersion Kit
The I-CWIK by Nereus Medical is a lightweight, portable, and rapid-deployment cold water immersion kit designed to treat exertional heat illness in the field. Compact and easy to set up, the I-CWIK provides immediate full-body cooling wherever it’s needed – whether on the sidelines of sporting events, at endurance races, or in remote work environments.
As the exclusive distributor for Australia and New Zealand, Blacksmiths brings this proven solution directly to organisations who need to protect athletes, workers, and teams operating in extreme conditions. Trusted by elite sporting bodies and emergency response units worldwide, the I-CWIK ensures rapid cooling when seconds count.
Registered as a Class 1 Medical device on the Therapeutic Goods Association ARTG
Evidence base for cold water immersion in exertional heat illness
Supporting the use of ICWIK in high-risk and remote operational environments
Exertional heat stroke is a time-critical emergency
Exertional heat stroke (EHS) is defined by severe hyperthermia with central nervous system dysfunction following intense physical activity. Unlike many medical emergencies, outcomes in EHS are primarily determined by the duration of elevated core temperature, not by hospital-based interventions alone.
Across military, sports medicine, and occupational health literature, rapid reduction of core temperature is the single most important determinant of survival and neurological outcome.
Cold water immersion is the gold-standard treatment
Whole-body cold water immersion (CWI) is consistently identified as the most effective treatment for EHS due to its ability to rapidly extract heat from the body.
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A landmark review by Casa et al. described CWI as the gold standard for EHS, citing unsurpassed survival rateswhen cooling is initiated immediately and continued until core temperature falls below approximately 39–40 °C.
Reference: Casa DJ et al., Cold Water Immersion: The Gold Standard for Exertional Heat Stroke Treatment
https://polarproducts.com/polarshop/pc/catalog/pdf/Cold_Water_Immersion_Gold_Standard.pdf -
A systematic review examining cooling modality, cooling rates, and survival outcomes confirmed that faster cooling is associated with improved survival, with cold water immersion consistently outperforming alternative techniques.
Reference: Filep EM et al., Exertional heat stroke, modality cooling rate, and survival outcomes
https://www.mdpi.com/1648-9144/56/11/589 -
Cooling rate matters more than cooling method
The clinical goal in EHS is to reduce core temperature as quickly as possible. Evidence repeatedly shows that CWI achieves cooling rates of approximately 0.15–0.35 °C per minute, exceeding commonly cited minimum targets for safe and effective treatment.
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Reviews of human and field data demonstrate that methods such as ice packs, misting, fans, or cold intravenous fluids cool significantly more slowly and are often insufficient when used alone.
Reference: Gaudio FG & Grissom CK, Cooling methods in heat stroke
https://www.sciencedirect.com/science/article/pii/S0736467915009440 -
Experimental and clinical evidence indicates that no other widely available modality consistently matches the cooling performance of cold water immersion.
Reference: Nye AM et al., Cooling Methods in Heat Stroke
https://pmc.ncbi.nlm.nih.gov/articles/PMC5076277/ -
“Cool first, transport second” is evidence-based
Because neurological injury and organ failure are driven by ongoing hyperthermia, multiple expert groups recommend on-scene cooling prior to transport when cold water immersion is available.
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Evidence-based clinical guidance emphasises that delaying cooling in order to transport a patient worsens outcomes, particularly in remote or operational settings.
Reference: DeGroot DW & O’Connor FG, Exertional heat stroke: an evidence-based approach
https://physoc.onlinelibrary.wiley.com/doi/abs/10.1113/EP090488 -
The International Liaison Committee on Resuscitation (ILCOR) reviewed the available human evidence and concluded that water immersion provides the strongest evidence for effective cooling in heat stroke, despite the absence of randomised trials.
Reference: ILCOR Heat Stroke Cooling Evidence-to-Decision Framework
https://costr.ilcor.org/assets/images/photos/Etd_Heat-Stroke-Cooling-FINAL_SAC_Approved_27-Nov-2019.pdf
Relevance to operational and austere environments
EHS risk is highest in environments characterised by:
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High physical workload
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Heat exposure
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Protective clothing or PPE
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Remote or delayed access to definitive medical care
This includes police, military, mining, oil and gas, construction, and mass participation events. In these settings, the evidence supports having cold water immersion capability at the point of risk, rather than relying on transport to hospital for definitive cooling.
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Military data demonstrate effective cooling and high survival using ice-cold water immersion in operational contexts.
Reference: Wood F et al., Outcomes of UK military personnel treated with ice cold water immersion
https://militaryhealth.bmj.com/content/170/3/216.abstract -
Large endurance events using on-site immersion protocols report consistently favourable outcomes, even in severe cases of exertional heat stroke.
Reference: DeMartini JK et al., Effectiveness of cold water immersion at the Falmouth Road Race
https://scholar.archive.org/work/jv7zeqb2djg5ljk7lx7r6i5rvi
Evidence-based alignment of ICWIK
The medical literature is clear on the core requirements for effective EHS treatment:
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Whole-body or near-whole-body immersion
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Very cold water
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Rapid deployment at the point of injury
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Use in non-hospital, operational environments
ICWIK aligns with these evidence-based principles by enabling rapid, immersion-level cooling in environments where fixed tubs or hospital facilities are unavailable. This allows organisations to implement definitive, guideline-supported treatment for exertional heat stroke at the point of need.
Summary
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Exertional heat stroke is survivable when treated correctly.
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Speed of cooling is the dominant factor influencing outcome.
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Cold water immersion is the most effective, evidence-supported intervention available.
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Deployable immersion systems enable organisations to close the critical gap between collapse and cooling in high-risk environments.
