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Heatwave Thermalwear

Heatwave® Pack of 2 Men's Thermal Underwear Set, Long Sleeve Top & Long Johns Set

Regular price £16.67 GBP
Regular price Sale price £16.67 GBP
Sale Sold out
Tax included. Shipping calculated at checkout.
Carbon-neutral shipping with Shopify Planet
All deliveries are carbon neutral


0.45 tog rating- hold more warm air close to the skin. Thermal underwear base layers with a soft brushed inner made from an advanced insulating yarn giving them high performance insulation. Comfort fit, the ribbed construction shapes to the contours of the body. The tops are also side seam free for extra comfort, Long johns are open fly.


Small - Top (Chest Size) 34-36” : Long John (Waist Size) 29-32”
Medium - Top (Chest Size) 37-39” : Long John (Waist Size) 33-35”
Large - Top (Chest Size) 40-42” : Long John (Waist Size) 36-38”
X-Large - Top (Chest Size) 43-45” : Long John (Waist Size) 39-42"
XX-Large - Top (Chest Size) 46-48” : Long John (Waist Size) 43-45”

n.b. all sizes are approximate


White, Blue, Charcoal, Black, Navy, Grey


50% Polyester, 50% cotton


Machine washable at 40°C, can be tumble dried, wash dark colour's separately


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.

We also work closely with Royal Mail to ensure hassle-free, on-time delivery. Generally processing times are within 1 business day* although currently those times vary due to the issues relating to COVID-19 and government orders and the impact to our business. 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.
*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?

Email or message us within 35 days of purchase to explore your hassle-free return options. We have made it easy for you to cancel for a full refund. Please review our Refund Policy for more information. We appreciate your patience and understanding as we work through this together. Thank you so much for your support!


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.


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.

Heatwave®_Thermalwear_Product_Infographic_Thermal_Long Sleeve_Underwear_Sets_Outdoor_Baselayers

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 15 reviews
Iain Mclintock (Enfield, GB)

A very speedy delivery and extremely happy with the items.

Paul Collins (Windsor, GB)
Good value thermals

Very pleased with the 2 packs of thermals.
Good value and quality.

Avril Peters (Sheffield, GB)

Very comfortable and a good fit

Michael Buller (London, GB)
Heatwave 2 pack thermal underwear XXL review

The materials was great for the initial base layer and did what was asked. Although a good fit for the width etc they are not the best choice for the taller wearer with the sleeves and the leg length being a issue and too short. No option for long fit.

William Sweet (Steyning, GB)
Great product!!!

Received promptly delighted with quality will recommend to all friends thank you excellent service.

New Forest Jane (Portsmouth, GB)
Warm as toast.

Exactly what was needed for this cold snap! Warmest base layer ever purchased. Excellent! Shame the ladies’ version is out of stock!!

John Harris (Swansea, GB)
Heatwave thermals

Great service, replied immediately to original email. Good quality thermals. Would but again from this company

Khrystyna Tarnovetska (Dunfermline, GB)

Heatwave® Pack of 2 Men's Thermal Underwear Set, Long Sleeve Top & Long Johns Set

John Manlove (Verwood, GB)

Difficult to review these as they were for my ex husband! And so far the weather hasn’t been that cold….

sharon Moore (Lancaster, GB)
Great service and quality products

Items received swiftly and packaged well. Item are we f very good quality and great value for money. I wouod highly recommend