Superfeet FLEXthin Insoles
Superfeet FLEXthin InsolesSuperfeet FLEXthin InsolesSuperfeet FLEXthin Insoles
Superfeet FLEXthin InsolesSuperfeet FLEXthin Insoles

Superfeet FLEXthin Insoles

  (1 Review)
  • Biomechanical shape with Aerospring foam construction
  • Heel-to-toe cushioning for enhanced comfort with every step
  • Heel cup naturally absorbs impact to reduce heel pain
  • MOISTUREWICK technology for long-lasting odour control
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£21.25(Inc. 20% VAT)
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Superfeet FLEXthin Insoles

With MOISTUREWICK technology and an Aerospring foam construction, the Superfeet FLEXthin Insoles are ideal for providing long-lasting comfort from heel to toe. They are designed to eliminate odour, while boosting comfort and reducing pain through impact-absorbing heel protection.

Who Can Benefit from the Superfeet Insoles?

With a soft foam upper construction, the FLEXthin Insoles are ideal for providing general comfort for the whole of the base of the foot. They are also particularly suited to anybody looking to target support in the heel area.

Key Features of the FLEXthin Insoles

  • Aerospring foam is 3mm thick for a thin and comfortable design
  • MOISTUREWICK technology provides long-lasting odour control, in turn boosting hygiene and comfort
  • Biomechanical shape ideal for a wide range of footwear
  • Heel cup helps to position the heel to absorb impact
  • Ventilated forefoot improves air circulation and breathability for enhanced comfort and hygiene
  • Available in a choice of sizes for the best possible fit

How Do the FLEXthin Insoles Support the Foot?

The Superfeet FLEXthin Insoles combine a versatile biomechanical shape with the comfort and support of Aerospring foam for optimal foot support. The FLEXthin Insoles have been designed to support the foot in a range of ways, including the following:

  • Eliminates Odour: The insoles are designed with MOISTUREWICK technology for optimal long-lasting odour control
  • Heel Support: The heel cups position the heel to naturally absorb impact, reducing associated pain
  • Improves Breathability: Forefoot ventilation improves breathability for enhanced comfort and freshness
  • Improves Comfort: The thin Aerospring foam layer is 3mm thick for thin heel-to-toe comfort with every step

Superfeet Flexthin Insoles
FLEXthin Insoles with Aerospring foam 
for heel-to-toe comfort

Aerospring Foam Construction

The Superfeet FLEXthin Insoles feature Aerospring foam, which is 3mm thick for optimal comfort. As this comfort is targeted from the heel to the toe, this underfoot cushioning helps to prevent pain caused by daily activities and walking around. The thin design also helps the insoles fit into a wider range of shoes without reducing the level of comfort provided.

MOISTUREWICK Odour Elimination

The Superfeet FLEXthin Insoles feature MOISTUREWICK technology to help eliminate odours for improved hygiene and comfort. This is particularly useful for ensuring that feet can remain as fresh and hygienic as possible, reducing odour and boosting confidence.

Enhanced Heel Protection

Specially designed to support the heel, the Superfeet FLEXthin Insoles are ideal for anybody looking to ease pressure under the heels. The heel cups are positioned to naturally absorb impact, reducing the risk of pain or damage to the heel that could arise when walking on ground that is too hard.

Superfeet Flexthin Insoles
Heel cup helps to naturally absorb
impact to reduce pain and discomfort

Available Sizes

To ensure the best possible fit, the Superfeet FLEXthin Insoles are available in a choice of sizes. The table below outlines the available sizes, which are based on UK shoe sizes; your required size can be selected from the drop-down menu at the top of the page.

Size UK Shoe Size
B Size 2 - 3.5
C Size 4 - 5.5
E Size 8 - 9.5
F Size 10 - 11.5

60-Day Money-Back Guarantee

If you aren't completely satisfied with the comfort or performance of your Superfeet Insoles, simply return them within 60 days of purchase to receive credit or a refund. This does not apply to products that have been damaged, misused or abused or those that have been incorrectly trimmed or cleaned resulting in damage.

UK Delivery Information & Fees

This product is normally dispatched by Royal Mail. The normal delivery expectation of this service is 1 to 3 working days.

When ordering before 2.00pm (Monday to Friday), your item will usually be dispatched the same working day.

We offer free delivery on all orders of £40.00 and over. On orders below £40.00, a £3.95 delivery charge is applied.

Order Value Delivery Fee Delivery Timescale
Up to £39.99 £3.95 1 to 3 working days
£40.00 and over FREE 1 to 3 working days

Please see our specific delivery information page for more information. For up to the minute delivery information, please call our customer care team on 020 7501 1102 who will be happy to help.

Our Guide to Finding the Perfect Size and Fit

Using Your Shoe Size

For most of our insoles, the easiest way to find the best size for you is to go off of your current shoe size. The majority of our insoles are available in a range of sizes and you can simply select the size that best fits your existing shoes.

Please be aware that, as with shoes, there can be slight variations in the size of insoles. For example a size 8 of one brand might not be exactly the same size and width as the size 8 of another. To help account for these discrepancies, a number of our insoles include dimensions to help you ensure you're getting the right size.

Measuring Your Current Insoles

While using your shoe size to find your best size is a good guide, it is not always foolproof. If you want to guarantee that your insole fit your shoes as closely as possible, we recommend measuring your existing insole and using this as a guide to your size.

To do this, please follow the steps outlined below:

  1. Remove the existing insole from the shoes you wish to use your new insoles with (please note that not all insoles are removable)
  2. Measure the insoles at their longest and widest points (see the below diagram for an idea of where this will be
  3. Match the measurements to the dimensions of the insoles listed, and choose the size that best fits your results

How to measure your insoles

Where Can I Find the Dimensions?

The dimensions for insoles can be found on the "Product Details" tab (please see below) and are usually found in the sizing section of the listing, in a table. Please be aware that not all products currently have the dimensions listed.

Product Details Example
The dimensions of insoles can usually be found on the "Product Details" tab

What If There Are No Dimensions Listed?

If you do not see the dimensions listed on the Product Details tab, please fill in the form below and we will work to get the relevant information as quickly as possible. We will email you once we have the information that you have requested.


Trimming Your Insoles to Fit

To get the ultimate level of fit from your insoles, you can trim them to make a small adjustment. To trim your insoles, simply follow the steps below:

  1. Remove your existing insoles from your shoes
  2. Line up your existing and new insoles at the heel
  3. Trace the outline of the insoles against the new pair at the toe end (see the image below for an example)
  4. Carefully cut along the traced line
  5. Your insoles should now fit your shoes better

Trace the outline of your existing insoles
Carefully trace the outline of your insole

Please note that not all insoles are suitable for trimming. Most insoles are unsuitable for return once they have been trimmed to fit; we recommend bearing this in mind prior to trimming.

If you would like a more detailed guide to trimming your insoles, please read our full guide on How to Trim Your Insoles.

UK Product Support

We're ready and waiting to help.

Free UK Delivery

When you spend £40 or more.

Customer Reviews
Average Rating (1 Review):  
Write a Review and share your opinions!

Good for tighter shoes
Wednesday, 18 May 2022  |  Royeros

Work really well in tighter fitting shoes. Felt a bit too tight in the shoe at first, but the sole seemed to bed in after walking around a bit and then was fine.

Was this helpful to you?  Yes  /  No

This review has not been appraised.


Hi Royeros,

Many thanks for taking the time to leave a review with us.

We find that a new insole can often take a few wears to properly "bed in", especially when the shoes they're used with are leather or tight-fitting. This is because the foundation of the insole has not yet had time to properly expand to the correct proportions of the shoe. As you mention, this tends to clear up once the insole has had time to adhere and fit to the base of your shoe.

We hope this information proves helpful and we look forward to hearing from you again soon.

Kind regards,

Seth at

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