How to Care for White Thermal Underwear


Thermal underwear is typically worn for two reasons. The main reason for thermal underwear is to stay warmer in the winter. There is also thermal underwear sold for the opposite use. Some underwear is designed to prevent sweat from sticking to the body when running or exercising. Thermal underwear is usually made from either cotton or polyester. Depending on the kind of underwear purchased, care instructions vary slightly.

Things You'll Need

  • Stain remover
  • Washing machine
  • Laundry detergent
  • Bleach
  • Fabric softener


  • Apply stain remover to the neck and underarms of the thermal underwear. Spray these areas regardless of whether the stains are visible. Over time, sweat stains will build up, causing the fabric to yellow. Allow to soak for 10 minutes.

  • Place the underwear in the washing machine and add laundry detergent.

  • Set the washing machine to a cool wash setting on a delicate or gentle cycle.

  • Pour about a capful of fabric softener in with the clothing, along with about 1/3 cup of bleach.

  • Hang the clean clothing outside in the sun to line dry or lay flat to dry when the wash cycle is completed. Do not dry thermal underwear in the dryer because the cotton may shrink or become misshapen.


  • Spray the neck and underarms of the underwear with stain remover. Allow to sit for 10 minutes.

  • Turn the underwear inside out and place inside the washing machine.

  • Add laundry detergent and set the water temperature gauge to warm. Set the wash cycle to gentle or delicate.

  • Pour a capful of fabric softener in with the underwear to reduce static electricity. Add 1/3 cup of bleach to maintain the white appearance of the underwear.

  • Remove the underwear when the fabric is clean. Hang the underwear to dry outside or lay flat to dry. Drying the underwear in a dryer will cause it to shrink, and polyester will wear out much faster if dried frequently.

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