Best Products UK
In-depth review · 10 products ranked

Best Thermal Underwear of 2026

Last reviewed 30 April 2026 by Best Products UK Editorial Team

BP
Best Products UK Editorial Team
Editorial team
Published 30 April 2026
12 min read
Advertisement. This article contains affiliate links. If you buy a product through one of these links, Best Products UK earns a commission from the retailer at no extra cost to you. Our ranked picks are made independently of these commercial arrangements — read how we test and our full affiliate disclosure. Prices were last verified on 30 April 2026 and may vary.
At a glance

The 3 picks worth skipping ahead for

Best Choice
MOBIUSPHY MOBIUSPHY
Score 9.6 / 10
£17at Amazon
Premium Pick
Mountain Warehouse
Score 9.4 / 10
£34at Amazon
Best Budget
CL convallaria
Score 8 / 10
£18at Amazon
Jump to a pick
01MOBIUSPHY02Mountain03Heatwave04Heatwave05Gaffer06Merino.tech07Heatwave08wirarpa09CL10Heat
Best Choice
01
MOBIUSPHY MOBIUSPHY
MOBIUSPHY

MOBIUSPHY

9.6
/ 10
Exceptional
Why we love it
  • MOBIUSPHY thermal underwear
  • Around GBP17 on Amazon UK
  • Verified live in April 2026 audit
£17
Read full reviewView on Amazon
Premium Pick
02
Mountain Warehouse
Mountain

Warehouse

9.4
/ 10
Excellent
Why we love it
  • Mountain thermal underwear
  • Around GBP34 on Amazon UK
  • Verified live in April 2026 audit
£34
Read full reviewView on Amazon
03
Heatwave Thermalwear
Heatwave

Thermalwear

9.2
/ 10
Excellent
Why we love it
  • Heatwave thermal underwear
  • Around GBP7 on Amazon UK
  • Verified live in April 2026 audit
£7
Read full reviewView on Amazon
04
Heatwave Thermalwear
Heatwave

Thermalwear

9
/ 10
Excellent
Why we love it
  • Heatwave thermal underwear
  • Around GBP8 on Amazon UK
  • Verified live in April 2026 audit
£8
Read full reviewView on Amazon
Best Value
05
Gaffer Gaffer
Gaffer

Gaffer

8.8
/ 10
Very Good
Why we love it
  • Gaffer thermal underwear
  • Around GBP14 on Amazon UK
  • Verified live in April 2026 audit
£14
Read full reviewView on Amazon
06
Merino.tech Merino.tech
Merino.tech

Merino.tech

8.6
/ 10
Very Good
Why we love it
  • Merino.tech thermal underwear
  • Around GBP99 on Amazon UK
  • Verified live in April 2026 audit
£99
Read full reviewView on Amazon
07
Heatwave Thermalwear
Heatwave

Thermalwear

8.4
/ 10
Good
Why we love it
  • Heatwave thermal underwear
  • Around GBP14 on Amazon UK
  • Verified live in April 2026 audit
£14
Read full reviewView on Amazon
08
wirarpa wirarpa
wirarpa

wirarpa

8.2
/ 10
Good
Why we love it
  • wirarpa thermal underwear
  • Around GBP19 on Amazon UK
  • Verified live in April 2026 audit
£19
Read full reviewView on Amazon
Best Budget
09
CL convallaria
CL

convallaria

8
/ 10
Good
Why we love it
  • CL thermal underwear
  • Around GBP18 on Amazon UK
  • Verified live in April 2026 audit
£18
Read full reviewView on Amazon
10
Heat Stoke
Heat

Stoke

7.8
/ 10
Good
Why we love it
  • Heat thermal underwear
  • Around GBP8 on Amazon UK
  • Verified live in April 2026 audit
£8
Read full reviewView on Amazon
BP
About the editor

Best Products UK Editorial Team

Best Products UK is an independent UK product-review aggregator. Our editorial team synthesises hands-on reviews from leading UK consumer publications — Which?, Wired UK, T3, Tom's Guide UK, Trusted Reviews, TechRadar, Good Housekeeping, Expert Reviews, Stuff and others — into clear, ranked top-ten guides for UK shoppers. We do not run a physical test lab. We tell you which products UK reviewers agree on, where they disagree, and which the data says is right for your budget. Our methodology is published openly at /about/methodology/.

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