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Mens Original Thermal Underwear Bottoms - Black

  • Regular price £19.99
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Heat Holders

Whether you need thermal protection outdoors or some extra warmth and comfort at home, these Mens Original Thermal Underwear Bottoms in Black will make your life warmer.

Heat Holders men's thermal underwear features micro-fleece fabric, with ideal stretch properties and comfort seams to allow full freedom of movement and a comfortable, non-chafing fit that’s perfect for layering your base layers. Finally, moisture and odour management technology help to keep you warm dry and fresh all day long.

Our love of warmth and comfort is backed up by proven science and over 50 years of technical expertise. At the core of every Heat Holders base layer is our advanced super-soft thermal microfleece, combining performance insulation, comfort and dryness. But the real secret of our warmth lies inside: our expert brushing process creates a soft fur-like pile that holds even more warm air close to your skin, maximising thermal performance and comfort to keep you warmer for longer.

Heat Holders base layers are available in three different thicknesses.

  • Original is our thickest and heaviest base layer, perfect for extreme cold.
  • Lite is our medium thick base layer, ideal for very cold days.
  • Ultra Lite is our lightest base layer, great for everyday cold.

For optimal warmth and comfort, we recommend you consider both activity levels & temperature. Our thicker base layers may be better when activity levels are low, while our lighter base layers may be more appropriate when activity levels are high.

Please check the size guide above before purchase

Fibre Composition: 100% Polyester

Machine Washable at 30°C. Heat Holders can be tumble dried but are happiest when line dried.

Heat Holders Technology

heat holders illustration of Japanese-designed thermal yarn

Japanese-designed thermal yarn provides insulation with superior breathability and softness.

heat holders illustration of innovative knitting technology

Innovative knitting technology produces our UK PATENTED long loop cushion pile to hold more warm air.

heat holders illustration of expert brushing process

Our expert brushing process maximises the amount of warm air held in for unbeatable warmth.

heat holders illustration of HEATWEAVER® Insulation

HEATWEAVER® Insulation is a plush fur-like thermal lining that maximises the air held close to the body.

5 Star Service

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Free UK Delivery & Returns

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Over 40,000 5 Star Reviews

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Customer Reviews

Based on 9 reviews
Stephen E.
Great thermals, length is an issue

Lovely and warm as always, however after ordering my usual size the length is somewhat lacking only reaching half way down my calves. I would suggest ordering a size up, however then too big around the waist. Other than that I can’t fault them

Graham ..S.
Thermal long johns

Once again another great product from heat holders . I have been buying the socks for over 10 years & the recent purchase of thermal long johns are certainly up to heat holders brilliant standards of warmth when out in the cold .


Warm , ang snug. Fine for 32 inch waist , although I am not sure if it fits 33 inch waist . Although the label says it should.


Excellent, my husband says they are the best he has ever had.

Vernon P.
Good Product, but a bit tight

Good quality. Had issues with the delivery failing to show up. Received on the second attempt. The length and waist of the trousers are just right and the warmth is good but they are tight around the hips and upper legs.