Duvet Warmth Without the Guesswork: Reading TOG Ratings Like a Spec Sheet
TOG is a published thermal measurement, not a marketing word. Here is how to match published ranges to your bedroom, season, and sleeping temperature.
TOG measures thermal insulation in published numbers, which makes duvet shopping unusually rational: your room temperature and personal thermostat map directly onto a range.
Short verdict
- Published 4.5–7 TOG suits warm rooms and hot sleepers; 10.5 TOG is the all-season default for most bedrooms.
- Published 13.5+ TOG is for cold rooms under 18°C (64°F) — pairing it with a warm room is the classic night-sweat mistake.
Pick by scenario
- You share a bed with a cold sleeper: Two single duvets, different published TOG — The Scandinavian published-standard solution ends the thermostat war without compromise.
- You want one duvet year-round: Published 10.5 TOG with a breathable cover — Mid-range insulation plus layering covers both seasons reasonably.
- Air-conditioned summer bedrooms: 4.5 TOG or published summer-weight fills — Light published fills prevent the 3 a.m. blanket kick.
What not to overpay for
- Thread-count arms races on covers — published fill quality and baffle-box construction matter more.
- Down-alternative “upgrades” whose published fill power is unlisted.
The honest tradeoffs
Higher published TOG trades breathability for warmth. Down trades washability for longevity; published down-alternative fills trade lifespan for easy care.
FAQ
Is TOG the same for all fill types?
The published measurement is; how fills achieve the number differs — down traps air, synthetics insulate by structure.
Do kids need different TOG?
Yes — published children’s guidance recommends lower TOG values; follow age-specific published safety guidance.
