John Lewis Heat Generating Thermal Leggings, Black

Product information

These heat retaining and heat generating thermal leggings will be a life saver during the winter months.

Heat is generated using the body's moisture, and the warmth is retained through a snug, comfortable fit.

The leggings are quick drying, have moisture wicking properties and are anti-static.

John Lewis
Eligible for International Delivery
Lingerie Type
Thermal Underwear
57% acrylic, 39% viscose, 4% elastane
Thermal Type
Washing Instructions
Hand wash



We want you to be happy with your purchase. If you're not, depending on the type of product, you can make free returns in the UK via John Lewis shops, Royal Mail, Collect+, or MyHermes. If you need to arrange collection of large or heavy items, call us on 03456 049 049. For international returns queries, call us on +44 1698 545 454. Find out more about returns.

You'll find returns information on your delivery note. Unless faulty, we'd like you to make your return within 90 days of purchase. Exceptions apply to certain products - find out more about our refund policy.

Q & As

Rated 4.1 out of 5 by 27 reviewers.
Rated 4 out of 5 by Warm undergarments I did try to wrap these 'heat generating' leggins around a cup of cold water but they didn't generate any heat. A triumph of marketing over physics, I think? Nonetheless, these give an effective under-layer when you need to keep warm and they don't cause any visible lumps and bumps. I wear them working from home on the PC to avoid putting on the heating and they do the job. 13 October 2015
Rated 5 out of 5 by Leggings that are very long These leggings come up very long. If you are tall as I am they are wonderful but I would suggest considering buying a smaller size. I went for 16/18 and I am sure 12/14 would have fitted. How nice to purchase something that it a) longer enough and b) fits with ease. They also machine wash brilliantly. 04 March 2015
Rated 1 out of 5 by wrongly-sized and baggy I bought these at the same time as JL Polar fleece leggings size S/M. These are size 12-14. They are 32cm bigger round the waist (though only 4cm longer). They are extremely baggy and have an annoying seam down the inside of the leg, which left an unsightly line on my skin. They are made of much thinner fabric than the polar fleece leggings and are not as warm. I bought 2 pairs, so I'm returning the pair I haven't worn. 24 January 2015
Rated 5 out of 5 by Great product These leggings are so comfortable and add warmth without bulk. 04 March 2014
Rated 4 out of 5 by Lovely Leg Warmers Bought these as an alternative to my cycling leggings and they are every bit as good at keeping me warm, though they are thinner. Sizing is good though the leg length is longer than expected. Overall a good purchase and will be buying more when needed. 04 March 2014
Rated 3 out of 5 by they're okay. they are nice and soft and they do keep you warm but you can achieve the same results with a pairof fleecy tights.... 09 February 2014
Rated 5 out of 5 by Excellent value These are fantastic! I'm delighted to find a size 12-14 instead of 10-12 - these leggings fit perfectly in length & width. I have worn them under thick tights which is really cosy, better than tights under conventional leggings and has the advantage of no bulk or knee bagginess. I have a long sleeved top as well. These are super base layers for carol singing on cold nights. 22 December 2013
Rated 3 out of 5 by Ok but go bobbly They are comfortable and warm. And yes if you are short like me (30") leg, they will also keep your feet warm. However, after wearing on about 4 occasions under jeans they have gone a bit bobbly. Not what I expected from John Lewis quality and for that reason would not buy again. 21 January 2013
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