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Thermax Vest

Thermax thermal dog vest fits under harnesses. Fleece-lined, 4-way stretch, slim-fit design. Perfect for active dogs in cold weather.

4.9
Rated 4.9 out of 5 stars
39 Reviews
Sale price£48.50
Colourway:
Available in
Thermax Vest Size Guide
 Size Guide Girth (cm) Length (cm)
XS 30 - 39 30
S 40 - 49 35
M 50 - 59 40
L 60 - 69 47
XL 70 -79 52
2XL 80 - 89 58

Description

Warmth without the bulk, freedom without compromise

Imagine your dog staying warm on cold winter walks while still wearing their harness comfortably. The Thermax Vest delivers cosy insulation in a slim-fit design that works seamlessly with your existing gear, so your dog gets the warmth they need without sacrificing mobility or control.

Why the Thermax Vest is the perfect layering solution

Its ultra-slim, 4-way stretch fit makes it the perfect base layer to wear underneath a harness. Whether you have a deep-chested Vizsla or a slender Greyhound, the ergonomic zip-up design contours to the body, ensuring no cold air gaps and zero snagging on undergrowth.

How It Helps:

  • Under-Harness Compatibility: The slim profile allows you to put your favourite harness over the vest with no bulk.
  • Body-Heat Insulation: Lattice polar fleece lining reflects heat back to the core for extreme warmth.
  • 4-Way Microfibre Stretch: Total range of motion—ideal for running, hiking, and agility.
  • Thermoseal Taped Seams: Fully water-resistant with a YKK back-zip to keep the spine dry.
  • Quick-Dry Technology: Lightweight fabric that doesn't get heavy when wet and dries rapidly after a wash.

Looking for a different level of warmth? Browse our complete collection of winter dog jackets for more outdoor protection.

Pro Tip:

Need heavy-duty rain protection? If you are heading out in torrential rain and need a rugged shell to wear over your harness, take a look at the Element Jacket.

Features

• Ergonomic Fit
• High Quality Thermal Fabric
• Lattice Polar Fleece Liner
• YKK Zip
• Thermoseal taped seams

Works well with..

Express Harness

Express Harness

£31.00

A black Thermax Vest for dogs, designed to be worn underneath a harness/collar, with a red logo visible.
Thermax Vest Sale price£48.50
4.9
Rated 4.9 out of 5 stars
Based on 39 reviews
Total 5 star reviews: 35 Total 4 star reviews: 4 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
100%would recommend this product
Slide 1 selected
39 reviews
  • K
    Kate
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    3 weeks ago
    Nice vest

    Rex is not overly keen on putting it on, but once on he is fine and it keeps his core warm and dry. Doesn’t stop him running around!

  • KR
    Kirra R.
    Verified Buyer
    I recommend this product
    How old is your dog? 0-2
    What is your Dog Breed? Border Collie
    Size Bought M
    Dog's Weight 11-15kg
    Rated 5 out of 5 stars
    2 months ago
    Genuinely the best vest ever

    I bought this for my collie x kelpie, she’s 14kg and fits perfectly into a size medium. I walked her at 5am every morning through winter in the snowy mountains and she stayed toasty warm underneath but it didn’t stop her from moving freely. 10/10 would re purchase. Please enjoy video of Darby showing you her new vest.

  • GG
    Garrett G.
    Verified Buyer
    I recommend this product
    How old is your dog? 8+
    What is your Dog Breed? Staffy
    Size Bought L
    Rated 4 out of 5 stars
    4 months ago
    Thermal vest

    Fantastic quality, very well built. My only negative is that even though the vest is a snug fit, it tends to slip down the body becoming a hindrance for dogs front legs

  • J
    Jane
    Verified Buyer
    I recommend this product
    How old is your dog? 8+
    What is your Dog Breed? Irish Terrier
    Size Bought L
    Dog's Weight 11-15kg
    Rated 5 out of 5 stars
    5 months ago
    Perfect vest for a cold Hobart winter

    My 13 tear old Irish girl was feeling the winter cold. The Ezyydog looked the best option to keep her warm but not impede movement and well designed. The Ezydog crew recommended the L for length which was the right call. It is easy to put on - paws in then zip up/ very quick to remove also. She can wear a raincoat over it too if it’s really stormy weather. Mouse wears her Thermax vest every day when she goes out as well as her Ezydog light, perfect for late afternoon walks and crossing roads. I highly recommend.

  • SM
    Shannon M.
    Verified Buyer
    I recommend this product
    How old is your dog? 0-2
    What is your Dog Breed? Cavoodle
    Size Bought S
    Dog's Weight 6-10kg
    Rated 5 out of 5 stars
    5 months ago
    Thermax Vest

    I bought my dog Luca a thermax vest so he can wear it to daycare as they require all jumpers/jackets to be fitted to prevent other dogs limbs or collars from being trapped during play. This vest is perfect, it’s fitted, comfy, warm and water resistant. It fits under his harness and also drys fast after I wash it. Would definitely recommend.