Bio Fusion 4° Orthotic Insoles: Structured Support for Overpronation

The right orthotic insoles can provide additional support, stability and comfort inside suitable everyday footwear.

The Bio Fusion 4° Orthotic Insoles from LBG Medical combine a supportive medium arch with an integrated four-degree medial rearfoot post. This professional orthotic design is intended to provide structured biomechanical control for people experiencing mild to moderate overpronation or reduced rearfoot stability.

Manufactured from lightweight biodegradable TPU, the Bio Fusion shell provides flexibility and resilience while maintaining a slim, low-profile shape.

The insoles can also be professionally customised through heat moulding, grinding and the application of self-adhesive components, allowing a qualified podiatrist or orthotist to adapt them to individual requirements.

What Are Bio Fusion Orthotic Insoles?

Bio Fusion is a range of professional prefabricated orthotic insoles manufactured by LBG Medical.

Unlike basic foam insoles that mainly provide cushioning, Bio Fusion uses a structured TPU shell designed to provide support beneath the arch and rearfoot.

The range is available with different posting and arch options. The product discussed in this guide features:

• Four-degree medial rearfoot posting
• Medium arch profile
• Small size: UK 5–6.5
• Lightweight biodegradable TPU shell
• Slim-profile heel cup
• Professional customisation options

Correct selection depends on the wearer’s foot shape, gait, symptoms and required level of control.

What Is Overpronation?

Pronation is a natural movement that occurs when the foot rolls slightly inwards while standing, walking or running.

This movement helps the foot adapt to the ground and absorb impact. However, when the inward movement becomes excessive, it is commonly described as overpronation.

Overpronation may be associated with:

• Reduced arch stability
• Greater inward movement at the rearfoot
• Uneven shoe wear
• A feeling of reduced foot stability
• Fatigue during prolonged walking or standing

Not everyone who overpronates experiences pain, and not every case requires orthotic support. Persistent symptoms should be assessed by an appropriate healthcare professional.

Are Overpronation and Flat Feet the Same?

Flat feet and overpronation are related but are not exactly the same.

Flat feet describe a low or absent visible arch, while overpronation refers to the way the foot moves and rolls inwards.

A person can have naturally low arches without experiencing problematic overpronation. Similarly, someone may display excessive inward movement even when their arches do not appear completely flat.

For this reason, choosing an orthotic solely because it is advertised for flat feet may not provide the correct support.

Professional assessment can help determine whether a medium-arch orthotic with four-degree posting is appropriate.

How Does a 4° Medial Rearfoot Post Work?

The Bio Fusion shell incorporates a four-degree medial post into the rearfoot section.

The post is designed to provide structured support around the inside of the heel and rearfoot. This can help manage excessive inward movement and improve stability during the gait cycle.

According to LBG Medical, its four-degree Bio Fusion option is intended for mild to moderate overpronation, providing subtle rearfoot stabilisation without creating excessive restriction.

The four-degree post is built into the shell rather than supplied only as a loose wedge. This allows it to deliver consistent structured support.

Why Choose a Medium Arch Profile?

Arch height is an important consideration when choosing orthotic insoles.

The Bio Fusion medium arch provides contoured support beneath the foot and may suit people who require more structure than a flat or low-profile cushioned insole offers.

A suitable arch profile can help the foot feel more stable inside the shoe. However, an arch that is too high, too firm or incorrectly positioned may cause pressure or discomfort.

A medium arch should not automatically be selected simply because someone has flat feet. Foot length, arch shape, flexibility and individual tolerance all affect suitability.

If you are uncertain, ask a podiatrist or orthotist to assess the fit.

Professional Support Without Excessive Bulk

Traditional orthotic devices can sometimes feel heavy or take up too much room inside footwear.

Bio Fusion is designed with a slim heel cup and low-bulk TPU shell, helping it fit inside a wider selection of suitable enclosed shoes.

Its lightweight construction may make it easier to accommodate in:

• Trainers with removable insoles
• Everyday lace-up shoes
• Selected work shoes
• Walking footwear
• Roomier casual shoes

Compatibility still depends on the individual shoe. Very narrow, shallow or tightly fitted footwear may not provide enough internal space.

Biodegradable TPU Construction

The Bio Fusion shell is manufactured from high-quality biodegradable thermoplastic polyurethane, commonly known as TPU.

LBG Medical selected this material for its combination of:

• Durability
• Flexibility
• Resilience
• Lightweight support
• Heat-mouldable properties
• Grindable construction

The structured shell is designed to maintain its supportive shape while offering enough adaptability for professional modification.

The manufacturer’s biodegradable description does not mean the product should be placed in ordinary household compost. Disposal should follow any relevant manufacturer or local guidance.

Slim-Profile Heel Cup

The heel cup helps position the rearfoot within the orthotic.

Bio Fusion uses a slim, low-profile heel cup to provide support without adding unnecessary bulk inside the shoe.

For effective fitting, the heel section should sit flat and securely at the back of the footwear. It should not rock, slide or lift during walking.

A shoe with a firm heel counter and secure fastening will generally accommodate an orthotic more effectively than loose, open-backed footwear.

Professionally Customisable Orthotics

One of Bio Fusion’s key features is its ability to be modified by a trained professional.

Possible adjustments include:

• Heat moulding
• Grinding the TPU shell
• Adding rearfoot wedges
• Applying heel cushions
• Using 5mm heel lifts
• Applying full-length or three-quarter top covers

These modifications allow a podiatrist or orthotist to adapt the device according to the patient’s individual presentation.

Specialist heat moulding and grinding should not be attempted at home without the correct clinical training and equipment.

Rearfoot Wedges

LBG Medical’s standard component pack includes rearfoot wedges in different degrees.

These components can be used by an appropriate professional to alter rearfoot alignment and modify the level of control.

The included wedge options may allow the original orthotic to be adapted if the wearer’s assessment indicates that a different level or direction of posting is required.

Do not attach corrective wedges without understanding their effect. Incorrect placement may change foot alignment in an unsuitable way.

Heel Cushions

Heel cushions provide additional shock absorption beneath the heel.

They may be added when the wearer requires extra cushioning, but their suitability depends on the cause of the symptoms and the available space inside the shoe.

Adding components increases the total thickness of the orthotic, so footwear fit should be checked again after any modification.

Five-Millimetre Heel Lifts

The supplied 5mm heel lifts are intended for professional customisation where heel elevation is considered appropriate.

Heel lifts are not automatically necessary for overpronation or flat feet. Their use depends on individual assessment and may relate to specific biomechanical or lower-limb requirements.

Using a heel lift without appropriate advice could alter balance, gait or footwear fit.

EVA Top Covers

Bio Fusion orthotics are supplied with self-adhesive EVA top-cover components.

The top cover provides a softer surface over the structured TPU shell and helps improve comfort throughout the shoe.

LBG Medical describes the top covers as high-quality EVA with an antimicrobial microfibre covering designed to improve hygiene and discourage bacterial growth.

Check the exact boxed contents before use, as supplied components may differ between product versions or packages.

Who Might Consider Bio Fusion 4° Insoles?

The four-degree medium-arch version may be worth considering for people who have been assessed as requiring:

• Support for mild to moderate overpronation
• Increased rearfoot stability
• Structured medium-arch support
• More control than a basic cushioned insole
• A low-profile professional orthotic shell
• An orthotic that can be clinically customised
• Support during everyday walking or prolonged standing

These are general considerations rather than a diagnosis or personalised recommendation.

Choosing the Correct Size

This Small version corresponds with:

UK size: 5–6.5
EU size: 38–40
US women: 7–8.5
US men: 6–7.5

Shoe sizing can vary between brands, so the marked footwear size alone does not guarantee a perfect orthotic fit.

Check that:

• The heel sits securely at the back
• The arch aligns comfortably with your foot
• Your toes are not crowded
• The orthotic does not move during walking
• The footwear still fastens securely
• There is no concentrated pressure or rubbing

If the shape feels unsuitable despite choosing the correct numerical size, seek professional fitting advice.

Which Shoes Work Best with Orthotic Insoles?

Bio Fusion orthotics are best suited to secure, enclosed footwear with sufficient internal depth.

Suitable footwear may include:

• Lace-up trainers
• Walking shoes
• Selected work shoes
• Roomier casual footwear
• Shoes with removable factory insoles
• Footwear with a firm heel counter

They may be difficult to accommodate in:

• Very narrow shoes
• Shallow footwear
• Slip-on shoes with little adjustment
• Open-backed shoes
• Sandals
• High heels
• Tight formal footwear

Where possible, remove the shoe’s original loose insole before inserting the orthotic. Placing an orthotic on top of a thick existing insole may cause crowding or heel slippage.

How to Fit Bio Fusion Insoles

Before using the insoles:

1. Confirm that you have the correct size and left and right orthotics.

2. Remove the original loose insoles from the shoes where possible.

3. Place each Bio Fusion orthotic inside its corresponding shoe.

4. Push the heel section fully and evenly against the back.

5. Put on the shoes and secure the laces or fastening.

6. Check for pressure, rubbing, slipping or crowding.

7. Walk indoors for a short period to assess the fit.

The orthotic should feel supportive, but it should not cause sharp pain, numbness or intense pressure.

Allow Time to Adjust

Your feet and lower limbs may require time to adapt to a structured orthotic.

Begin with a shorter period of wear and increase gradually if the insoles remain comfortable.

Do not assume that significant pain is a normal part of adjustment. Stop using the orthotics and seek professional advice if you experience:

• Persistent or increasing pain
• Numbness
• Tingling
• Blisters or rubbing
• Skin discolouration
• New ankle, knee, hip or back symptoms
• A feeling of instability

Individual comfort and response can vary.

Orthotic Insoles Are Not a Cure

Bio Fusion insoles provide supportive biomechanical control, but they do not permanently correct or cure flat feet, overpronation or another medical condition.

They should form part of an appropriate management plan based on individual needs.

Depending on the cause of the symptoms, a healthcare professional may also discuss:

• Footwear changes
• Strengthening exercises
• Activity modification
• Physiotherapy
• Weight management
• Clinical assessment
• Further investigation

Avoid making medical claims based solely on how an insole is marketed.

When to Seek Professional Advice

Speak to a podiatrist, orthotist, physiotherapist, GP or another appropriate healthcare professional if you have persistent pain or uncertainty about which orthotic to choose.

Professional advice is particularly important if you have:

• Diabetes
• Poor circulation
• Reduced foot sensation
• Neuropathy
• Open wounds or skin damage
• A recent injury
• Significant swelling
• Persistent foot, ankle or knee pain
• A diagnosed musculoskeletal condition
• Previous foot or ankle surgery

People with reduced sensation may not notice pressure or skin injury developing, making professional fitting especially important.

Bio Fusion 4° Specifications

Manufacturer: LBG Medical
Product: Bio Fusion
Product type: Prefabricated professional orthotic insoles
Posting: Integrated four-degree medial rearfoot post
Arch profile: Medium
Size: Small
UK size: 5–6.5
EU size: 38–40
US women’s size: 7–8.5
US men’s size: 6–7.5
Shell material: Biodegradable TPU
Heel cup: Slim, low-profile design
Customisable: Yes, by an appropriately trained professional
Quantity: One pair

Included Components

The boxed set may include:

• One pair of Bio Fusion orthotic shells
• Two heel cushions
• Two 5mm heel lifts
• Rearfoot wedges
• Self-adhesive EVA top covers
• Original Bio Fusion retail packaging

Standard manufacturer packs may include 2°, 4° and 6° rearfoot wedges together with full-length and three-quarter top covers.

Check the product photographs and listing for the exact components included with the item being offered.

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When you shop with us, you benefit from:

• Genuine branded products
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• 30-day returns, subject to the published policy

Our aim is to help customers access quality products while receiving excellent value and attentive service.

Support Your Feet with the Correct Orthotic

The Bio Fusion 4° Orthotic Insoles combine a structured medium arch, integrated medial rearfoot post and lightweight biodegradable TPU shell.

Their low-profile design provides professional-grade support without the excessive bulk of some traditional orthotics, while the customisable construction allows an appropriately trained professional to modify them when required.

For someone who has been assessed as needing moderate support for mild to moderate overpronation, Bio Fusion offers an adaptable and thoughtfully designed option.

Correct size, footwear compatibility and individual suitability remain essential. Seek professional advice if you are unsure whether this particular posting or arch profile is appropriate for your feet.

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Bio Fusion Orthotic Insoles for Flat Feet UK 5–6.5 – LuxuryForLess.uk

 

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Frequently Asked Questions

Are Bio Fusion 4° insoles suitable for flat feet?

They may provide structured support for some people with lower arches or flat feet, but suitability depends on foot shape, movement and symptoms. Flat feet do not automatically mean that a four-degree medium-arch orthotic is appropriate.

What level of overpronation are they designed for?

LBG Medical describes the four-degree version as suitable for mild to moderate overpronation.

What does the four-degree medial post do?

It provides structured support along the medial rearfoot and is designed to improve stability and help manage excessive inward movement.

Are the insoles soft or firm?

They use a structured TPU shell with EVA top covers. They provide firmer biomechanical support than an ordinary soft foam insole.

Can the insoles be heat moulded?

Yes, but heat moulding and grinding should be performed only by an appropriately trained professional using suitable equipment.

Can I wear them immediately for a full day?

It is normally sensible to begin with shorter periods and increase wear gradually if they remain comfortable. Stop if you experience persistent pain, numbness or rubbing.

Can they be used in work shoes?

They may fit selected work shoes with sufficient depth, a secure fastening and enough internal space. Compatibility depends on the individual footwear.

Can I place them over my existing insoles?

Where possible, remove the shoe’s original loose insole first. Stacking insoles may cause crowding, heel slippage or pressure.

Do orthotic insoles cure flat feet?

No. Orthotic insoles can provide support and help manage movement, but they do not permanently cure flat feet or another medical condition.

Who should seek professional advice before using them?

Anyone with diabetes, poor circulation, reduced sensation, open wounds, an existing injury or persistent foot, ankle, knee or walking pain should obtain appropriate healthcare advice before use.