Answer: thermal

AnswerCrossword Clue
THERMAL

Like some underwear

THERMAL

Part of BTU

THERMAL

Like some blankets or underwear

THERMAL
Heat-related
THERMAL
Updraft
THERMALLike hot springs
THERMALHeat-retaining
THERMALWarm.
THERMALProducing heat
THERMALType of underwear
THERMALInsulating
THERMALLike some blankets
THERMALWarming
THERMALKind of underwear
THERMALKind of blanket
THERMALAssociated with heat
THERMALRising current of warm air