Answer: thermal

AnswerCrossword Clue
THERMALType of underwear
thermalof or retaining heat
thermala rising mass of warm air
THERMALRising current of warm air
THERMALAssociated with heat
THERMALKind of blanket
THERMALKind of underwear
THERMALWarming
THERMALLike some blankets
THERMALInsulating
THERMALLike some underwear
THERMALProducing heat
THERMALWarm.
THERMALHeat-retaining
THERMALLike hot springs
THERMALUpdraft
THERMALHeat-related
THERMALLike some blankets or underwear
THERMALPart of BTU