# Relaxsan 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.

- [Original product page](https://bargainpostbox.co.uk/product/relaxsan-3500-extra-warm-thermal-lumbar-belt)
- [View offer](https://bargainpostbox.co.uk/visit/relaxsan-3500-extra-warm-thermal-lumbar-belt)
- Market: UK
- Language: en-GB
- Currency: GBP
- Brand: Relaxsan
- Model: 3500
- Category: Beauty & Health > Health & Medical Care > Medical Aids
- Price: 27.71 GBP
- Previous price: 36.95 GBP
- Discount: 25%
- Price checked: 2026-11-14T10:13:39.501Z
- Rating: 3.8 / 5
- Reviews: 9

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## 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.

## 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.

## Specifications

### Product and warmth
- Model: 3500
- Style: UNISEX EXTRA WARM
- Fabric weight: 250g/m2
- Temperature range: -15°/+5°
### Materials and care
- Fibres: Dryarn fiber and Merino wool
- Washing recommendation: 30° \(wool and delicates\) without aggressive detergents
- Ironing: It does not require ironing.

## Before you buy

- 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.

## 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 feedback

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.

## Alternative options

- [Cysocool Thermal Cashmere Knit Lumbar Warmer Lower Back Support Belt Brace Stomach Kidney Warmer Abdominal Binder Waist Trimmer Band Postpartum Belly Wrap](https://bargainpostbox.co.uk/visit/relaxsan-3500-extra-warm-thermal-lumbar-belt)
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- [Fitomo Back Support Belt for Men Women, 0.5mm Ultra-Thin Yoga Fabric \| Lower Back Support, 3D Lumbar Pad, 6 Flexible Supports, Seamless Yoga Fabric, Lightweight 0.5mm Design, Daily Wear, L](https://bargainpostbox.co.uk/visit/relaxsan-3500-extra-warm-thermal-lumbar-belt)
- [Gotoly Waist Trainer Men Body Shaper Tummy Control Corset Shapewear Seamless Slimming Girdle Workout Belly Band Waist Trimmer with Zipper](https://bargainpostbox.co.uk/visit/relaxsan-3500-extra-warm-thermal-lumbar-belt)
- [Aroma Season Heat Pad for Back Pain Relief, Cordless Heated Back Warmer with Vibration Massager, 5000mAh Power Bank, 3 Heating Levels, 3 Vibration Modes, Heated Belt for Women and Men \(Black\)](https://bargainpostbox.co.uk/visit/relaxsan-3500-extra-warm-thermal-lumbar-belt)
- [Cysocool Thermal Cashmere Knit Lumbar Warmer Lower Back Support Belt Brace Stomach Kidney Warmer Abdominal Binder Waist Trimmer Band Postpartum Belly Wrap](https://bargainpostbox.co.uk/visit/relaxsan-3500-extra-warm-thermal-lumbar-belt)
- [Bodyprox Breathable Back Brace, Back Support Brace for Men and Women - Enhanced Lumbar Protection, Breathable Compression, for Sports & Daily Wear \(L\)](https://bargainpostbox.co.uk/visit/relaxsan-3500-extra-warm-thermal-lumbar-belt)
- [IKEEPFIT Cordless Heat Pads for Back Pain Relief, 10000mAh Back Warmer Pad \| 3 Heat 3 Vibration, Graphene Lower Back Massager Warmer Belt for Lumbar Abdomen Cramps, 20-min Auto Off, Gifts for Women Men](https://bargainpostbox.co.uk/visit/relaxsan-3500-extra-warm-thermal-lumbar-belt)
- [Fitomo Back Support Belt for Men Women, 0.5mm Ultra-Thin Yoga Fabric \| Lower Back Support, 3D Lumbar Pad, 6 Flexible Supports, Seamless Yoga Fabric, Lightweight 0.5mm Design, Daily Wear, M](https://bargainpostbox.co.uk/visit/relaxsan-3500-extra-warm-thermal-lumbar-belt)
- [iNszkoos Insulated Velvet Knit Lumbar Warmer for Men Women Thermal Lower Back Support Brace Stomach Kidney Warmer Waist Abdominal Binder Postpartum Belly Wrap](https://bargainpostbox.co.uk/visit/relaxsan-3500-extra-warm-thermal-lumbar-belt)

## Images

![Relaxsan 3500 Thermal Lumbar Belt, Extra Warm — 1](https://bargainpostbox.co.uk/i/J0ccWM7hfaXeKiIxC5Vk20IojfV7Gof5WsAu6LcVYITljhi05EUwJHRTQ3S7QiEHPtkHhuwLxO3eLw5rflF4HXLn4rrKKnLVO7M7dFF52iZJi_ixXCGUgpXj.jpg)

![Relaxsan 3500 Thermal Lumbar Belt, Extra Warm — 2](https://bargainpostbox.co.uk/i/Mv-FtQOKqLNvE2I5fgnD0KgP8hFCPhGAzA55BVRcR839rMBe0teG3BQIWmc987GN1UaZxwiLVr7jfW8nFgr7ZWBkKs3dHPx9RMxcbvYf1RaenO3urEhtWeZ8.jpg)

![Relaxsan 3500 Thermal Lumbar Belt, Extra Warm — 3](https://bargainpostbox.co.uk/i/wUx1kbBHKFgZ2MlcSJ-9PBreZhUbGrw-_Ibg_VZ7NBBmTmMKJ43_9GVibPIORM-57pKV3v-QuqAUumKqWfigSwdQXk_oNfHWMtHm0K1QjSGpnqL2Y_npeB2g.jpg)

![Relaxsan 3500 Thermal Lumbar Belt, Extra Warm — 4](https://bargainpostbox.co.uk/i/ZV8LpV6o7UVX-N-SckMEue2Du60Ht_tEZWknjb413z6TUSzk6O16fXKJK3CY3AjmsLoT66Ph4eFW5jaddHMXmYpQ8h07xUcphBwIISTdbuGeTC6JuNxGV5uY.jpg)

![Relaxsan 3500 Thermal Lumbar Belt, Extra Warm — 5](https://bargainpostbox.co.uk/i/5SvsdMVtObGOwoCgfkTAkQTaQt7A3gKziRBG6wvaA67JqKmNPnJiMEJWxP7lZMow5ET_Z6EiAp6wDo4VmPXZsDVxu4yfxaW48wXoDQFkI8F4sliPIED9HRZt.jpg)

![Relaxsan 3500 Thermal Lumbar Belt, Extra Warm — 6](https://bargainpostbox.co.uk/i/_RLapJEJrEVMJ0EIYd09tcX-OqEK5Wrm3JVrxORFo3d_xyjJR7OvNZVXDZVmg_GtAYS1jKUiTbT4VM5TwvzyAeilzwpAvl1IuAUlXu6O6EnSBfxhmTylOSNp.jpg)

![Relaxsan 3500 Thermal Lumbar Belt, Extra Warm — 7](https://bargainpostbox.co.uk/i/ff5oikpQle4AIbetXanJG_MK6YTcAefRoQifQ7Oxp_4YYyZ30lrWeGF6HusHqXJEXjH1cTLN97ER7zqHeQyqwjL5CJzDmGb6jdY74mcPpDgxvEuiPWR3F4ad.jpg)