1 / 7Relaxsan 3500 Thermal Lumbar Belt, Extra Warm
The Relaxsan 3500 thermal lumbar belt is a unisex extra-warm layer made for the lower back. Its Merino wool and Dryarn fabric are described as insulating, breathable and quick-drying, while the seamless stretch construction is intended to sit close to the body during movement.
At a glance
- The listing positions the 250g/m2 version for colder conditions than its 150g/m2 Light Warm line.
- Merino wool is described as a natural thermal insulator, while Dryarn is presented as breathable and quick-drying.
- Seamless, stretch fabric is designed for a close fit and freedom of movement.
- The manufacturer says it can be machine-washed on a 30° wool and delicates setting.
Reference price: £36.95
Price checked: 14 Nov 2026
View offerAhead of Black FridayExplore the selectionPros and cons
Pros
- Unisex design and a close-fitting stretch construction suit layering under clothing.
- The listed fabric combines Merino wool warmth with Dryarn breathability and quick drying.
- Seamless fabric avoids seams that can feel bothersome beneath other layers.
Technical specifications
7 specifications| Model | 3500 |
|---|---|
| Style | UNISEX EXTRA WARM |
| Fabric weight | 250g/m2 |
| Temperature range | -15°/+5° |
| Fibres | Dryarn fiber and Merino wool |
|---|---|
| Washing recommendation | 30° (wool and delicates) without aggressive detergents |
| Ironing | It does not require ironing. |
What to know before buying
Listing details to confirm
The listing is internally inconsistent about the product identifier: the title and details give model 3500, while the page identity data contains a different ASIN from the supplied product page. Confirm the selected listing is the Relaxsan 3500 belt before ordering. The stated temperature range is a manufacturer recommendation, not a guarantee of comfort for every wearer or condition.
Who is it for?
A good fit for
- People seeking a close-fitting unisex thermal layer for the lower back in cold weather.
- Winter-sports or outdoor users wanting a fabric layer that can be worn beneath other clothing.
Less suited to
- Anyone seeking an adjustable support brace or a powered heated belt. The supplied description presents this as thermal underwear, not a brace or electrically heated product.
Customer reviews on Amazon
- 5 stars
64% 64% - 4 stars
0% 0% - 3 stars
12% 12% - 2 stars
0% 0% - 1 star
24% 24%
Only aggregate ratings are supplied, with a mixed pattern that includes both five-star and one-star ratings. The small rating sample cannot show why people rated it this way or establish specific strengths or faults, so use the fabric and care details to judge whether the thermal-layer design suits your needs.
Frequently asked questions
What temperatures is the Relaxsan 3500 intended for?
The listing labels it Extra Warm and gives a range of -15°/+5°. This is the manufacturer's guidance rather than a guaranteed comfort range.
What is the fabric made from?
The listing names Merino wool and Dryarn fiber, describing the combination as insulating, breathable, soft and quick-drying.
How should I wash the belt?
The manufacturer recommends washing at 30° on a wool and delicates setting without aggressive detergents. It says ironing is not required.
Is this a back-support brace or a heated belt?
The supplied description identifies a thermal underwear garment. It does not describe structural support or powered heating.
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