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Heatwave Thermalwear

Heatwave® Women's Thermal Long Sleeve Top Pack of 2 Base Layer Durable Warm Underwear for Cold Weather Running Hiking Outdoor Sports Workwear Available in Black Grey White Advanced Insulating Yarn 0.45 TOG Rating Comfort Fit Moisture-Wicking Breathable

Regular price £10.00 GBP
Regular price Sale price £10.00 GBP
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Heatwave® Women's Thermal Long Sleeve Top Pack of 2 Base Layer

Discover the warmth and comfort with the Heatwave® Pack Of 2 Women's Thermal Long Sleeve Top. Designed as durable warm underwear baselayers, these tops are perfect for active outdoor activities such as running, hiking, and sports, or even as workwear. These thermal tops stand out in the market due to their cotton-rich composition and innovative insulation technology.

Key Feature 1: Advanced Insulating Yarn

Description: The thermal tops are crafted from an advanced insulating yarn that provides high-performance insulation. The soft brushed inner layer ensures maximum warmth by trapping heat close to the skin.

Benefits: Enjoy consistent warmth without the bulk. This feature ensures you stay cozy in cold weather, making it ideal for various outdoor activities.

Key Feature 2: Comfort Fit and Ribbed Construction

Description: The ribbed construction of these tops allows them to shape perfectly to the contours of your body. The tops are also designed to be side seam-free, enhancing overall comfort.

Benefits: Experience a snug, comfortable fit that moves with you, reducing chafing and irritation. Perfect for prolonged wear during active pursuits.

Key Feature 3: 0.45 TOG Rating

Description: With a 0.45 TOG rating, these thermal tops effectively hold more warm air close to the skin, providing excellent insulation without compromising breathability.

Benefits: Stay warm without feeling overheated. This feature ensures you maintain a comfortable body temperature during various activities.


These thermal tops are available in various sizes to ensure a perfect fit for everyone. Please refer to our size chart to find your ideal size.

Colours Or Style Options

The Heatwave® Women's Thermal Long Sleeve Tops come in three classic colours: white, marl grey, and black. Choose the colour that best suits your style and needs.

Care Guide

For longevity and maintaining quality:

  • Machine washable at 40°C.
  • Can be tumble dried.
  • Wash dark colours separately.

Why Choose This Product

Choose the Heatwave® Women's Thermal Long Sleeve Top for unparalleled warmth, comfort, and durability. Made from a blend of 50% polyester and 50% cotton, these tops offer extra breathability without heat loss. With a comfort fit and advanced insulation, these tops are perfect for outdoor activities and workwear. Don’t just take our word for it; our customers rave about the superior quality and comfort of these thermal tops.

Additional Information

Usability: Perfect for outdoor sports, running, hiking, or as an everyday workwear base layer. These versatile tops adapt to various activities and environments, ensuring you stay warm and comfortable.

Warranty and Support: We stand by the quality of our products. Enjoy peace of mind with our customer support and return policy. If you're not satisfied, you can return the product hassle-free.


We have partnered with 20 innovative grassroot companies that we believe can help reverse climate change. We allocate a fixed margin from every sale to support fund nature-based carbon removal solutions such as reforestation and soil carbon sequestration. Fund companies such as DroneSeed, Grassroots Carbon, and Pachama.

We are committed at Sock Stack to neutralize our shipping emissions and remove carbon dioxide from the atmosphere. Learn more here.

We also work closely with Royal Mail to ensure hassle-free, on-time delivery. Generally processing times are within 1 business day*. Processing times may also be extended during holidays, launches/re-stocks, limited edition releases and promotions. We will notify you as soon as your order ships or if we foresee any issues with fulfilling your order. Read our full Shipping Policy for more information.
*Please understand that business days do not include weekends and Bank Holidays (United Kingdom).

£3.95 flat fee for all domestic within the United Kingdom (free shipping over £40), 2-4 working days.
£5.95 express fee for all domestic within the United Kingdom, 1-3 working days.

Easy returns

Not completely satisfied with your purchase? Reach out within 35 days to explore hassle-free return options. We've simplified cancelations for a full refund and additionally return requests can be made from your online account. Please review our Refund Policy for more details. Thank you for your patience and understanding as we navigate this together.


Sock Stack does not have a call centre and we're not set up to handle high volumes of phone calls.

The Sock Stack brand was built online, including our customer support. Though you may receive an automated response every once in a while, all channels are manned by human staff who are eager to help you out, quickly and efficiently.

Thank you again for visiting Sock Stack. For information on our new product launches, please follow us on Instagram & Facebook. For customer service inquiries, please send us a message on Facebook Messenger or e-mail us at For order inquiries, please include your order number for faster service.


Clearpay makes budgeting easier, allowing you to break down your payments into four installments, due every two weeks, interest free. Head over to Sock Stack and find something you love. Then, just add to bag and simply select Clearpay as your payment method at the checkout. Enjoy your new stuff right away and pay over four installments.

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Buy now and pay 30 days later with KLARNA payment portal. You get all the “closure” of a full upfront payment, but with the cash-flow benefits of spreading the cost. The total amount charged to your card is no greater than if you simply paid for the entire purchase up front.



We are a young, bold homeware brand. We’re fun, we’re social and we’re an upcoming brand that doesn’t sleep. Interested in partnering? Apply today to be part of our community.

Sock Stack

Our Mission

Heatwave Thermalwear® envisions becoming the most celebrated, trustworthy, and sought-after brand by offering superior, distinctive, and inexpensive thermal wear products that exceed every customer's expectations. Heatwave Thermalwear's® vision is to become a leading thermal underwear baselayer brand by delivering the most refined and high-grade products to the customers that are thoughtfully developed to withstand extremely cold conditions while offering enhanced protection and unmatched comfort.

Sock Stack

Function, Fit & Style

Heatwave Thermalwear® strives to provide a diverse collection of the highest quality and affordable thermal underwear to men and women. Our thermal socks, long-sleeve base layers, long johns, hats and gloves are meticulously designed to be safe, lightweight, and breathable, providing fast-wicking and added warmth. As a customer-first brand, we are committed to fostering solid and lifelong relationships with our clients and aspire to deliver exceptional quality and value in our products.

Customer Reviews

Based on 17 reviews

Great product

Nicola Baker (Worthing, GB)
Thermal long sleeve top

Lovely warm thermal tops. Only reason for 4 star are the sleeves are a bit short

Angela Fenlon (Warlingham, GB)
Thermal tops

Loved them beautiful and warm really big fir the size

dawn linehan (Manchester, GB)
A little on the small side

The item is good quality especially for the price, however, they do come up a little on the small size so you may want to size up.

Denise Mcloughlin (Bellshill, GB)
5 star

Thermal top excellent deliveted when said great service.x

Avis Humphries (Great Yarmouth, GB)
Thermal long sleeved top

Hard to find vests like these on the high street, googled long sleeve vests and choose these. Wanted them for everyday wear about the house now I’m older and feel the cold more and they are warm and not bulky. Deducted one star because my size, 18, was not in stock. I agree with other review that they are very large so I shouldn’t have gone up a size but that was the only option at the time. Good quality and neat finishing

Paula Archer (Luton, GB)
Excellent quality

Fleece lined great quality pretty neckline, will be purchasing again soon

W.G. (Manchester, GB)

Nice items. I wish I'd bought a size smaller though which I never say!!!! The sleeves are rather long and it may have felt warmer the vests being more snug.

J.G. (Portsmouth, GB)
Toasty warm

I bought these thermal breathable tops and leggings foe a trip to Poland.
They were lovely and kept me really warm

Adam Ashbourne (West Bromwich, GB)
Thermol long sleeve

Excellent quality
Fast delivery
Great price.
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