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Heatwave Thermalwear

Heatwave® Girls Thermal Long Sleeve Top and Pants Set for Kids Baselayer Set with Advanced Insulating Yarn Cotton-Rich Fabric Comfort Fit Ideal for Winter Warmth and Layering Soft and Breathable Machine Washable Available in Multiple Colors and Sizes

Regular price £7.00 GBP
Regular price Sale price £7.00 GBP
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Heatwave® Girls Thermal Long Sleeve Top & Pants Sets, Kids Baselayer Sets

Introducing the Heatwave® Girls Thermal Long Sleeve Top & Pants Sets, the ultimate solution for keeping your little ones warm and comfy. These kids' baselayer sets are designed to provide superior thermal insulation, perfect for battling the cold while ensuring maximum comfort.

Key Feature 1: Advanced Insulating Yarn

Description: Crafted with an advanced insulating yarn, these thermal sets offer high-performance insulation. The soft brushed inner ensures excellent heat retention by holding more warm air close to the skin, boasting an impressive 0.45 tog rating.


  • Your child stays warm without the bulk, making it perfect for layering during cold weather.
  • The advanced yarn provides consistent thermal regulation, ensuring comfort in various conditions.

Key Feature 2: Comfort Fit and Ribbed Construction

Description: The ribbed construction of these thermal sets shapes to the contours of the body, providing a snug yet comfortable fit. This design also features a side seam-free construction for added comfort.


  • Enhanced fit and comfort reduce irritation and allow for free movement, making these thermal sets ideal for active children.
  • The seamless design ensures that kids can wear them all day without discomfort.

Key Feature 3: Cotton-Rich Fabric

Description: Made from a blend of 50% polyester and 50% cotton, these thermal sets offer extra breathability without compromising on warmth. The cotton-rich fabric feels soft against the skin and provides excellent wicking properties.


  • The breathable material ensures that your child remains dry and comfortable by effectively managing sweat.
  • This feature is especially beneficial during physical activities, preventing the chill from damp fabric.


The Heatwave® Girls Thermal Long Sleeve Top & Pants Sets come in a range of sizes suitable for various age groups. Please refer to our size chart to find the perfect fit for your child.

Colours Or Style Options

Available in three versatile colours: White, Marl Grey, and Black. These classic options ensure that the thermal sets can be easily paired with other clothing items.

Care Guide

Machine washable at 40°C and can be tumble dried. It is recommended to wash dark colours separately to maintain the quality and longevity of the fabric.

Why Choose This Product

The Heatwave® Girls Thermal Long Sleeve Top & Pants Sets stand out for their exceptional warmth, comfort, and durability. With advanced insulating yarn, a comfort fit design, and breathable cotton-rich fabric, these thermal sets are a must-have for keeping your child cozy during colder months. Trusted by parents for their reliability and loved by kids for their comfort, these baselayer sets are an unbeatable choice.

Additional Information

Usability: Perfect for wearing under school uniforms, winter sports gear, or casual outfits. These thermal sets are versatile and practical for a variety of cold-weather activities.

Warranty and Support: We offer a satisfaction guarantee with a hassle-free return policy. Our customer support team is always ready to assist with any queries or concerns.


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 1 review
J.W. (London, GB)

All goods received promptly - they are for a gift and I am sure will be appreciated