• 2-Pack Women's Thermal Long Sleeve Tops Base Layer Insulated Warm Underwear for Outdoor Sports Running Hiking Cold Weather Workwear by Heatwave Thermalwear WHITE / 14-16 Thermal Underwear
  • 2-Pack Women's Thermal Long Sleeve Tops Base Layer Insulated Warm Underwear for Outdoor Sports Running Hiking Cold Weather Workwear by Heatwave Thermalwear BLACK / 10-12 Thermal Underwear
  • 2-Pack Women's Thermal Long Sleeve Tops Base Layer Insulated Warm Underwear for Outdoor Sports Running Hiking Cold Weather Workwear by Heatwave Thermalwear MARL GREY / 10-12 Thermal Underwear
  • 2-Pack Women's Thermal Long Sleeve Tops Base Layer Insulated Warm Underwear for Outdoor Sports Running Hiking Cold Weather Workwear by Heatwave Thermalwear Thermal Underwear
  • 2-Pack Women's Thermal Long Sleeve Tops Base Layer Insulated Warm Underwear for Outdoor Sports Running Hiking Cold Weather Workwear by Heatwave Thermalwear Thermal Underwear
  • 2-Pack Women's Thermal Long Sleeve Tops Base Layer Insulated Warm Underwear for Outdoor Sports Running Hiking Cold Weather Workwear by Heatwave Thermalwear Thermal Underwear
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Heatwave Thermalwear

Heatwave Thermalwear Womens Thermal Long Sleeve Base Layer Top Pack Of 2 Insulated Warm Underwear For Outdoor Activities

£10.00 GBP
£10.00 GBP
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🎯 Introduction

When the cold bites, you need a base layer that works as hard as you do — genuinely warm, genuinely comfortable, and invisible under everything you wear.

Trusted by thousands of happy Heatwave Thermalwear customers — quality you can feel from the moment it arrives.

👤 Who Is This For?

This thermal set is perfect for you if you:

  • Get cold easily and need reliable warmth from your very first layer
  • Ski, snowboard, hike, or spend time outdoors during winter
  • Want a thermal comfortable enough to wear under everyday clothes all day long
  • Are looking for a thoughtful, practical gift for someone who loves the outdoors

✨ 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.

📐 Sizes

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.

🎁 Gifting & Occasions

A genuinely thoughtful, practical gift for cold-weather lovers:

  • Perfect Christmas gift for outdoor enthusiasts, hikers, and skiers
  • A thoughtful birthday treat for them who feels the cold
  • Great Secret Santa present — practical, comfortable, always appreciated
  • Ideal self-care gift for anyone who spends time outdoors in winter

🧺 Care Guide

For longevity and maintaining quality:

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

❓ FAQ

  • Is this warm enough for skiing or outdoor sports? Yes — the insulating yarn and brushed interior are engineered for cold-weather performance as a base layer for skiing, snowboarding, and hiking.
  • Can I wear this under everyday clothes? Absolutely. The slim ribbed fit layers smoothly under jeans, trousers, or work attire without adding visible bulk.
  • Is it suitable for sensitive skin? Yes — the hypoallergenic fibres are gentle and non-irritating for comfortable all-day wear.
  • What sizes are available? Please refer to the Sizes section above for the full range. If you're between sizes, we recommend sizing up for the most comfortable layering fit.
  • Is it machine washable? Yes — machine wash at 40°C. Easy to care for, wash after wash.

🏆 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.

"Surprisingly warm and really comfortable. Wear these under everything in winter — brilliant quality."

📦 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.

🛒 Add to Basket

Stop dreading the cold and start enjoying it. Tap Add to Basket and feel the difference from your very first wear. ❄️

Shipping

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 £22), 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.

Contact

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 sockstack@outlook.com. For order inquiries, please include your order number for faster service.

Clearpay

Shop Sock Stack with Clearpay — split your order into four equal, interest-free fortnightly payments. No credit checks, no interest, no catch. Premium socks, underwear, thermalwear, and more. All yours now, paid at your own pace.

With Clearpay You Can:

  • Split your order into 4 equal payments — due every 2 weeks
  • Pay absolutely zero interest — ever
  • Get instant approval at checkout in seconds
  • Manage and track your payments easily via the Clearpay app
  • Stock up on multipacks now and spread the cost — without paying it all upfront

What Can I Buy with Clearpay at Sock Stack?

Clearpay is available across our entire range — from men’s bamboo and cotton socks and boxer shorts multipacks to Heatwave thermal underwear, women’s loungewear, and children’s socks. The bigger your bundle, the bigger your saving — and Clearpay means you don’t have to pay for it all today.

Why Use Clearpay at Sock Stack?

  • Free UK delivery on every order regardless of how you pay
  • Our full 35-day returns policy still applies
  • Buy more, save more multipack deals work seamlessly with Clearpay
  • Fully secure and encrypted checkout on every order

Clearpay is unregulated credit. Late fees apply. For UK residents aged 18+ only. Subject to eligibility. T&Cs apply. Please spend responsibly.

Klarna

Shop Sock Stack with Klarna — one of the UK’s most trusted buy now pay later payment providers. Spread the cost of your premium socks, underwear, thermalwear, and loungewear with zero interest and complete flexibility. No hidden fees, no surprises.

With Klarna You Can:

  • Pay in 3 interest-free monthly instalments — automatically collected every 30 days
  • Pay in 30 days — receive your order first, pay later
  • No interest, no hidden fees — ever
  • Instant approval at checkout — quick and easy, no lengthy applications
  • Manage all payments via the Klarna app

What Can I Buy with Klarna at Sock Stack?

Klarna is available on your entire Sock Stack order — whether you’re stocking up on a men’s socks multipack, investing in a full set of Heatwave thermalwear, refreshing your men’s underwear, or treating yourself to new women’s loungewear. The more you buy, the more you save — and Klarna means you can spread the cost without any extra charge.

Why Use Klarna at Sock Stack?

  • Free UK delivery on every order regardless of how you pay
  • 35-day returns policy still applies in full
  • Buy more, save more multipack deals work seamlessly with Klarna
  • Fully secure and encrypted checkout

Klarna’s Pay in 3 and Pay in 30 days are unregulated credit agreements. Borrowing more than you can afford or paying late may negatively impact your financial status and ability to obtain credit. 18+, UK residents only. Subject to status. T&Cs apply.

Influencers

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.

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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.

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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.