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Thermal Lab · kit calculator
Give us the start, the highest point and one forecast. The lapse rate does the rest: the temperature of every metre, the freezing line, the wind on top and the garments for each band you will cross.
Your race
T(h) = T₀ − 6.5 × (h − h₀) / 1000. Wind chill from the Environment Canada formula, applied below +10° and above 4.8 km/h. A standard atmosphere is a model: check the mountain forecast.
Start
+22.0°
Top
−4.1°
Feels on top
−10.4°
0° line
4,185 m
SUN · 800 m–1,185 m+22.0° → +19.5°
EMBER · 1,185 m–2,185 m+19.5° → +13.0°
FLARE · 2,185 m–3,185 m+13.0° → +6.5° · feels +3.0°
DUSK · 3,185 m–4,185 m+6.5° → 0.0° · feels −5.2°
NIGHT · 4,185 m–4,810 m0.0° → −4.1° · feels −10.4°
Wear at the start: Tee · Short 5"Carry for the climb: Long Sleeve · Wind Shell · Thermal Hoody · Tight · Storm Shell · Storm Pant
1096 g · $1518
Layering guide · by conditions
Layer for the hour, not for the day.
Four conditions you will meet in one mountain day. For each: what you wear from skin to shell, what you carry, and when to change.
- Shell · wind and rainWind Shell−2°/+14°
- Mid · warmthNot needed
- Base · next to skinLong Sleeve+4°/+20°
- LegsTight−8°/+12°
DUSK · −4° to +6°
Start a little cold. Ten minutes of climbing warms you by about ten degrees: if you are comfortable standing at the trailhead, you are overdressed.
- +8°Open the half-zip
- +12°Wind Shell off, into the pocket
- +14°Thumb loops off, sleeves up