Sweaty Betty
Therma Boost Thermal High Waisted Leggings
£110
£44
Product code: T129537S
About this style
Feel snug on cold-weather runs in these thermal leggings from Sweaty Betty. They're made from stretchy fabric with a brushed fleece lining and an elasticated high waist. Part of the brand's innovative HeatProtect range, these leggings offer temperature regulation and moisture-wicking protection whatever the weather. They're finished with side slip pockets and a back zip pocket.
Curated By

Details & care
Details & care
Fit and style
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Skinny fit
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Elasticated waist
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Mid rise
Composition
76% polyester, 24% elastane
Care
Machine wash according to instructions on care label
Delivery, collection & returns
Delivery, collection & returns
Delivery
Standard
Free over £60, or £3.99
Returns
UK returns
Free. Returns can only be arranged via postal options. Exclusions apply Full delivery and collection information Our returns policy
Exclusions apply
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Reviews (46)
Best ever base layer
Originally posted on sweatybetty.com
Love the warmth and the soft feel against my skin . Resent the fact that I go to the trouble to submit a review, then am told it is too short! So is my time!
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Different to my other pair??
Originally posted on sweatybetty.com
I bought these leggings in black as a second pair whilst my others are in the wash but so disappointed, same product and size ‘S’ as the pair I’ve already got in grey, but material not as nice, much tighter around the waist and shorter in the leg! I paired them up with my current ones and they’re smaller and shorter! Why??
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Best leggings I’ve bought
Originally posted on sweatybetty.com
Yes, I recommend this
I was recommended these leggings by a friend. The most expensive leggings I’ve bought but totally the best. Great quality and fit, so comfortable they are like a second skin. The material is so soft and they look fantastic. They stay perfectly in place - I’ve worn them for running, walking and in the gym. I’m definitely buying all the other colours.
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Warm, comfortable and keep me warm coaching.
Originally posted on sweatybetty.com
Yes, I recommend this
Bought for winter running, warm, feel comfortable and good relective light for low light/dark running. Good sized side pockets. I use them for run coaching and instructing bootcamp and they keep my legs warm in our cold northern climate.
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Happy at Half Price!
Originally posted on sweatybetty.com
I finally replaced my old SB thermal leggings after 6 years! These are much thinner but toasty warm and so far impressed. Whether they last as long ummm doubtful …. The quality does not seem as good but maybe technology has improved! I am 5ft9 and they are a tiny bit short. Looked shorter when they came out of the packet, but were much better on. I used my birthday code so got value for money. Unsure whether I would want to buy full price. I bought a medium which is my usual SB size and they initially felt a little snug but fine after 2 wears.
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Winter running leggings
Originally posted on sweatybetty.com
Yes, I recommend this
I have other pairs of Sweaty Betty running pants which I love and kept wanting the winter pants. I am so glad I finally got them!! Can’t believe I waited so long, much better for the winter running!!
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Great fit.
Originally posted on sweatybetty.com
Wife loves them. Really comfortable and look great on.
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Nice and warm
Originally posted on sweatybetty.com
Yes, I recommend this
Loving these leggings for colder days and wishing I had bought two pairs. They definitely do not fall down.
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10/10
Originally posted on sweatybetty.com
Yes, I recommend this
These are one of the most comfortable leggings I have purchased!
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Lovely leggings
Originally posted on sweatybetty.com
Yes, I recommend this
I love these warm and soft leggings. I have been wearing them a lot, both when coaching and also when running on cold days.
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Review
Originally posted on sweatybetty.com
Yes, I recommend this
True to size, warm and extremely comfortable for Zumba and Pilates
Helpful?
Warm, lovely but too short!
Originally posted on sweatybetty.com
Yes, I recommend this
These are too short! I’m 5’8 and the full length is just below mid calf. I wish you would do a 9/8 length..my daughter’s idea and I think it’s brilliant! Lots of people have longer legs these days.
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Warm and cosy
Originally posted on sweatybetty.com
Great fit and in this cold weather lovely and warm and so cosy
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Best leggings for cold weather running
Originally posted on sweatybetty.com
Yes, I recommend this
These are my second pair of Therma Boost Leggins. They were bought specifically for running in the cold weather…and they have not disappointed. True to size, I bought 7/8 small. However, when I buy them again I will buy the full length.
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Great features
Originally posted on sweatybetty.com
Yes, I recommend this
These leggings are so warm, feel good and dry extra quickly!
Helpful?
A Runner's Best Friend on a Chilly Winter Run
Originally posted on sweatybetty.com
Yes, I recommend this
This is my FIRST Running Leggings from Sweaty Betty. I wore it this morning for an 18 KM run, on a chilly Winter day in Canada. With the windshield it felt like -14. The leggings are like butter on my skin! They kept me warm. And in true Sweaty Betty signature style, they are so stylish. On a Grey Winer day this beautiful Green colour made me happy :) I am so grateful for this company for continuing to support athletic people, participating in physical movements looking so fine! As a yogi, I also practice in Sweaty Betty clothes. Thank You! I am proud to wear your clothes on my runs and in my yoga practices.
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A good purchase
Originally posted on sweatybetty.com
Yes, I recommend this
Nice quality. Very comfortable. I brought them when you had them on offer.
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Winter leggings
Originally posted on sweatybetty.com
Very comfortable and side pockets are very handy Lovely and warm for winter runs
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Great quality perfect for autumn/winter runs
Originally posted on sweatybetty.com
Yes, I recommend this
These are the best running leggings. They are comfortable, soft, have functional side pockets and the zipped back pocket. The reflective seams are perfect and don't wash off like the printed ones. It's my second pair because I loved the first ones so much and got another colour. They are thermal but may be not for extreme cold. For a milder UK winter runs they are perfectly fine
Helpful?
Comfy warm leggings that stay up
Originally posted on sweatybetty.com
Yes, I recommend this
Lovely warm leggings perfect for running on colder days, I should maybe have got the smaller size as they go a little baggy round my knees and aren’t as flattering as the power ones I normally get but they stay up well with phone and various other things in the pockets. Also like that they have pockets on both sides on these ones. Don’t really like the white over locked stitching though.
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