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Sweaty Betty

Online only

Therma Boost Half Zip Running Top

£110

£44

Colour

On Sale

    Sale items

    Customers say:

    Fits a little small()
    Size

    Customers say:

    Fits a little small()

    Product code: T129538S

    About this style

    Layer up for cold-weather runs in the Therma Boost top from Sweaty Betty. It's made in a slim fit from stretchy, moisture-wicking fabric with a brushed, fleecy lining for extra warmth. The funnel neck has a half-zip fastening for adjustable comfort, while the long sleeves feature practical watch and thumbholes. Two zipped pockets will store your on-the-go essentials.

    Curated By

    Details & care

    Item details

    Neck to hem length for a size 12: 59cm

    Fit and style

    Fitted

    Zip fastening

    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 (24)

    4.8

    71% Recommended this product

    Mentions
    24 April 2025YogaSouthJ
    Verified Purchase

    Flattering fit, warm top.

    Originally posted on sweatybetty.com

    Yes, I recommend this

    Flattering fit and warm top. Super colour. Very soft.

    Helpful?

    20 April 2025Dutch11
    Verified Purchase

    Better than a sweatshirt!

    Originally posted on sweatybetty.com

    Yes, I recommend this

    Better than a sweatshirt! I like to really sweat during a workout and this is great. So far has not retained a sweat smell. Also love to wear when walking my dog.

    Helpful?

    13 January 2025JGard
    Verified Purchase

    Good quality

    Originally posted on sweatybetty.com

    Yes, I recommend this

    Comfortable top, soft warm material , good quality

    Helpful?

    11 January 2025Rubetuesday
    Verified Purchase

    Very happy. So happy I bought two

    Yes, I recommend this

    Warm, comfortable and perfect for yoga, running and leisure activities

    Reviewer Ratings

    Quality

    Excellent

    Value for Money

    Good

    Style

    Good

    How did it fit?

    A bit small

    Comfort

    Excellent

    Material

    Excellent

    Helpful?

    Reviewer Ratings

    Quality

    Excellent

    Value for Money

    Good

    Style

    Good

    How did it fit?

    A bit small

    Comfort

    Excellent

    Material

    Excellent

    31 December 2024KateOD
    Verified Purchase

    Excellent top for all activities

    Originally posted on sweatybetty.com

    Great top, warm and comfortable for walking or at home. Lovely colours - now have it in cherry red, teal green and black. I find it a bit warm for running, but excellent for everything else.

    Helpful?

    30 December 2024Kira13
    Verified Purchase

    Very comfy and functional running half zip

    Originally posted on sweatybetty.com

    I absolutely love the therma boost running collection so this is another set and colour I got. After many runs and washes both leggins and the running half zip stay of the same quality. The only reason why I'm giving it 4/5 is because of the advertised feature for the watch hole. There's only one on the left side assuming all runners have their watches on that wrist...but there are still quite a few lefties out there or just those who do have their watches on the right wrist. Since there are 2 thumb holes, it would be nice to have 2 watch holes for everyone. As it is sadly isn't usable for me. Initially, I was looking for it and thought mine came without the watch hole and thought about returning until I realised I was looking for it on the "wrong" side. But for me that the "right" side. So a small request to sweaty betty designers if you could make an upgrade for those odd runners who have their watches on the right hand wrists. Other than that I love the colour, slim fit, soft material doesn't irritate sensitive skin, functional and spacious but not too buggy pockets and the reflective seam that doesn't wash off like the printed ones.

    Helpful?

    30 December 2024Anna Higson
    Verified Purchase

    The best top!

    Originally posted on sweatybetty.com

    I bought this for my winter walks and love it. It’s warm, but light and keeps me warm on my early morning exercise. I’d buy it in a different colour!

    Helpful?

    21 December 2024Xindy
    Verified Purchase

    Happy with purchase

    Originally posted on sweatybetty.com

    Nice smooth material which feels soft to touch. Thumb holes a nice touch. Looks great.

    Helpful?

    19 December 2024Magra
    Verified Purchase

    Runner

    Originally posted on sweatybetty.com

    Lovely piece as always. Bought S in sale. The M would be a better fit

    Helpful?

    19 December 2024Chrissy65
    Verified Purchase

    Warm, snug and stylish.

    Originally posted on sweatybetty.com

    Yes, I recommend this

    Very comfortable fabric, the fleece lining is lovely and soft. I ordered the small and it’s a good fit for me at 5’ 1”. The zipped deep pockets and the thumb holes on sleeves are really useful addition. I’ve been wearing mine too and from the gym keeping me warm and snug in this cold weather.

    Helpful?

    17 December 2024Running/ walking
    Verified Purchase

    Thermal boost running top

    Originally posted on sweatybetty.com

    Yes, I recommend this

    Excellent running top for this time of the year and then could be used as a warm top for after exercise on warmer days. Love the pockets, so useful.

    Helpful?

    13 December 2024A .I.
    Verified Purchase

    Therma running top

    Originally posted on sweatybetty.com

    Yes, I recommend this

    I bought this size S black Therma Running half zip top same size as my green one but the black colour is slightly bigger ! Not fitting nicely so I am hesitating whether to return it. Abit of disappointing thought .

    Helpful?

    12 December 2024VzBC
    Verified Purchase

    Soft and comfortable

    Originally posted on sweatybetty.com

    Yes, I recommend this

    Soft, warm and very confortable, perfect for cold weather runs or walking the dog

    Helpful?

    12 December 2024SueT
    Verified Purchase

    Nice top

    Originally posted on sweatybetty.com

    Yes, I recommend this

    Too short in the body. Fabric feels quite heavy, but good otherwise.

    Helpful?

    10 December 2024Sportway
    Verified Purchase

    Happy Customer

    Originally posted on sweatybetty.com

    Yes, I recommend this

    Comfortable and very warm sports top. Good quality and reasonable value at sale price!

    Helpful?

    08 December 2024Bethp22
    Verified Purchase

    Perfect for winter running

    Originally posted on sweatybetty.com

    Yes, I recommend this

    Keeps me warm but is breathable. Perfect for layering under a wind breaker. I will also be using as a base layer when I go to Iceland next year. Great top! Love the watch hole.

    Helpful?

    07 December 20240zz13
    Verified Purchase

    Cosy and flattering top for winter runs

    Originally posted on sweatybetty.com

    Yes, I recommend this

    Warm and very flattering top, makes the idea of winter running far more appealing as I know I’ll be nice and cosy in this! I wear with a base layer if especially cold, or on its own if milder. Love the thumbholes and the gap for the watch - minor point that it would be great to have the watch hole on the right arm too, as I wear my watch on my right wrist. Apart from that, perfect top for cold weather running!

    Helpful?

    03 December 2024Winter running girl

    Perfect winter running top.

    Originally posted on sweatybetty.com

    Yes, I recommend this

    I love this top. Soft, stretchy, comfortable & warm. Perfect for winter running.

    Helpful?

    28 November 2024AISB
    Verified Purchase

    Besutiful and comfortable

    Originally posted on sweatybetty.com

    Yes, I recommend this

    Great top. Very earm and versatile. It is perfect for putting on sfter the gym.

    Helpful?

    17 November 2024Michelle Carla
    Verified Purchase

    Great fit and confort.

    Originally posted on sweatybetty.com

    Yes, I recommend this

    I am wearing my top with the matching tights. I am heading out for a walk now. I recommend this jacket.

    Helpful?

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