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Archived noindex page. Kefiw's public focus is Property decision help.

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This older Kefiw page is kept for reference, marked noindex, and removed from the primary sitemap. The current Kefiw experience is focused on property decisions: cost, quotes, damage, buying, selling, owning, and packets.

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Insulation Logic · Clo Units

Required clo for air temp + activity; greedy garment-stack suggestion.

Clo = (33°C − Ta) / (8 × met). 1 clo ≈ business suit. Higher activity generates more metabolic heat, lowering required insulation. Cold under-dressed bodies divert bio-fuel from muscle to thermogenesis — pairs with Kinetic Expenditure.

Part of: Environmental Stressors

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Insulation Logic · Clo Units
Required Insulation
1.43 clo
at 4.4 °C · Brisk hike · 2.5 met
Metabolic burn
262 W
≈ 225 kcal/h heat out
Under-clo penalty
Cold body diverts fuel from muscle → thermogenesis. Dress for the delta to preserve bio-fuel.
Suggested Stack · 1.48 clo
· Parka / shell1.20
· Sweater0.28
Clo = (33 − Ta °C) / (8 × met). 1 clo ≈ business suit. Higher activity → lower clo needed (body generates heat). Pairs with Kinetic Expenditure — undressed in cold = bio-fuel diverted to heat.

How to use

  1. Enter air temperature and activity state.
  2. Read required clo; the suggested garment stack greedy-packs layers to meet the target.

Examples

40 °F · brisk hike
Required 0.7 clo · stack: fleece mid-layer + thermal base.

Before you act on the result

Health-related tools are educational planning aids. They can make a number or assumption visible, but they do not diagnose, treat, prescribe, or replace clinician guidance.

If the result points to risk, symptoms, medication questions, or urgent changes, use it as a note for a qualified professional rather than a final decision.

Next up

Layered up. Now verify the heat ceiling.Thermal Failure · WBGT → Long outdoors? Model the UV exposure too.UV Exposure Delta · Fitzpatrick MED →

Frequently asked questions

› What is 1 clo exactly? Definition

0.155 m²·K/W — the insulation of a 1950s business suit at rest in 21 °C, 50% RH, no wind.

› Why lower clo at higher activity? Troubleshooting

Metabolic heat production rises with met, so the body needs less external insulation. Runners over-dress and dump heat.

Tips & related reading

See the Environmental Stressors hub →

Tips & how-tos

Relevant links

Related tools

Thermal Failure · WBGT

Wet-bulb globe temperature — the heat-stress index used by OSHA, ACGIH, and military for work/rest cycle decisions.

Kinetic Expenditure · MET

Calories burned per activity using the MET (Metabolic Equivalent of Task) method from the Compendium of Physical Activities.

Bio-Fuel

Rank food by kilocalories per dollar and convert grocery spend into days of biological uptime at a 2,000 kcal baseline.