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Heatwave Thermalwear

Heatwave® Girls Thermal Fleece Leggings Pack of 3 Premium Warm Winter Pants for Kids Stretchable Comfortable Versatile Black Leggings Ideal for Cold Weather Outdoor Activities School Home Wear Skiing Hiking Sizes UK 5-6 7-8 9-10 11-13

Regular price £8.00 GBP
Regular price Sale price £8.00 GBP
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Heatwave® Pack of 3 Girls Leggings Thermal Fleece Kids

A lifestyle brand that combines style and comfort, giving you the confidence to express your individuality. Our design team interprets major trends and then adds functionality to fashion. All the panamas, dressing gowns, loungewear, dresses, jackets, and pieces you need - including our fit ranges Curve, Tall, Petite, and Maternity Collections - for a style that's all yours.

Key Feature 1: Thermal Fleece Lining

  • Description: Each pair of leggings in the Heatwave® Pack of 3 is lined with premium thermal fleece. This innovative material ensures that your child stays warm during cold weather while maintaining breathability.
  • Benefits: The thermal fleece lining provides superior insulation, keeping kids comfortable and cozy. Perfect for outdoor activities or simply lounging at home during winter months.

Key Feature 2: Stretchable Fabric

  • Description: Made from 100% polyester, these leggings offer exceptional stretchability. The fabric conforms to the body, allowing for unrestricted movement, making them ideal for active children.
  • Benefits: The stretchable fabric ensures a snug fit without sacrificing comfort. It allows kids to run, jump, and play freely, enhancing their overall experience.

Key Feature 3: Versatile Design

  • Description: The sleek, black design of these leggings makes them a versatile wardrobe staple. They can be paired with a variety of outfits, from casual tees to more formal dresses.
  • Benefits: The versatile design allows for easy mixing and matching, helping to streamline your child's wardrobe. This makes getting dressed in the morning simpler and more fun.


Select from a range of sizes to find the perfect fit for your child:

  • UK 5-6
  • UK 7-8
  • UK 9-10
  • UK 11-13

Colours Or Style Options

The Heatwave® Pack of 3 Girls Leggings are available in classic black, making them versatile enough to pair with any outfit.

Care Guide

Machine washable at 40°C. Wash with similar colours to maintain the leggings' quality and longevity.

Why Choose This Product

Choose the Heatwave® Pack of 3 Girls Leggings because they offer a perfect blend of style, comfort, and functionality. Designed to keep your child warm and comfortable, these leggings are perfect for various occasions. Trust in the quality of Heatwave® products, backed by numerous positive user testimonials, ensuring you receive the best value for your money.

Additional Information

  • Usability: Ideal for school, playdates, or relaxing at home, these leggings are versatile enough for any activity.
  • Warranty and Support: Backed by a satisfaction guarantee, with customer support available to address any concerns. Hassle-free returns ensure you can shop with confidence.


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.

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