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Sweaty Betty

Online only

Therma Boost Thermal High Waisted Leggings

£110

£44

Colour

On Sale

    Sale items

    Size

    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

    Fit and style

    Skinny fit

    Elasticated waist

    Mid rise

    Composition

    76% polyester, 24% elastane

    Care

    Machine wash according to instructions on care label

    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

    Full delivery and collection informationOur returns policy

    About Sweaty Betty

    Empowering women through workouts and beyond since 1998, Sweaty Betty’s iconic fitness gear will support you in reaching your fullest potential.

    Reviews (46)

    4.8

    78% Recommended this product

    Mentions
    05 April 2025Susmo65
    Verified Purchase

    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!

    Helpful?

    17 March 2025Elb75

    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??

    Helpful?

    16 March 2025Doddy123
    Verified Purchase

    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.

    Helpful?

    02 March 2025Civs88
    Verified Purchase

    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.

    Helpful?

    27 February 2025
    Verified Purchase

    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.

    Helpful?

    20 February 2025Runnermom!
    Verified Purchase

    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!!

    Helpful?

    13 February 2025Craig18
    Verified Purchase

    Great fit.

    Originally posted on sweatybetty.com

    Wife loves them. Really comfortable and look great on.

    Helpful?

    06 February 2025Tiateacake
    Verified Purchase

    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.

    Helpful?

    06 February 2025MMorin
    Verified Purchase

    10/10

    Originally posted on sweatybetty.com

    Yes, I recommend this

    These are one of the most comfortable leggings I have purchased!

    Helpful?

    29 January 2025Jul05
    Verified Purchase

    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.

    Helpful?

    27 January 2025Nadia_
    Verified Purchase

    Review

    Originally posted on sweatybetty.com

    Yes, I recommend this

    True to size, warm and extremely comfortable for Zumba and Pilates

    Helpful?

    18 January 2025JennT

    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.

    Helpful?

    16 January 2025Tf I
    Verified Purchase

    Warm and cosy

    Originally posted on sweatybetty.com

    Great fit and in this cold weather lovely and warm and so cosy

    Helpful?

    14 January 2025PK66
    Verified Purchase

    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.

    Helpful?

    13 January 2025MLed
    Verified Purchase

    Great features

    Originally posted on sweatybetty.com

    Yes, I recommend this

    These leggings are so warm, feel good and dry extra quickly!

    Helpful?

    05 January 2025Runner for Life
    Verified Purchase

    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.

    Helpful?

    02 January 2025FJNT
    Verified Purchase

    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.

    Helpful?

    01 January 2025ABot
    Verified Purchase

    Winter leggings

    Originally posted on sweatybetty.com

    Very comfortable and side pockets are very handy Lovely and warm for winter runs

    Helpful?

    30 December 2024Kira13
    Verified Purchase

    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?

    30 December 2024Katiecostume
    Verified Purchase

    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.

    Helpful?

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