tog
tog
Areal thermal resistanceexact by definition
The tog is exactly 0.1 m²·K/W, one tenth of an RSI. It is the textile industry's insulation unit and the one printed on duvets and sleeping bags: a summer duvet is 4.5 tog, a winter one 13.5, and a baby's sleeping bag is deliberately sold at 1.0 to 2.5 for safety.
| 1 tog | 0.1 RSI (m²·K/W) |
Where the unit came from
Devised at the UK Shirley Institute around 1946, named for "togs" as slang for clothing, and sized so that one tog is roughly the insulation of a light summer suit. It is a decimal-friendly cousin of the clo, and 1 clo is exactly 1.55 tog.
Solvers that use areal thermal resistance