Three-quarter view of the Flex Air navy wide fit trainer with leather and textile upper
Side view of the Flex Air navy wide fit trainer showing breathable textile panels
Front view of the Flex Air navy trainer showing its wide and deep toe shape
Rear view of the Flex Air navy trainer with a structured leather heel
Top view of the Flex Air navy lace-up trainer with perforated leather lining
Outsole view of the Flex Air navy trainer showing the supportive tread pattern
Top and outsole views of the Flex Air navy wide fit trainer
Three-quarter view of the Flex Air grey wide fit trainer with leather and textile upper
Side view of the Flex Air grey wide fit trainer showing breathable textile panels
Front view of the Flex Air grey trainer showing its wide and deep toe shape
Rear view of the Flex Air grey trainer with a structured leather heel
Top view of the Flex Air grey lace-up trainer with perforated leather lining
Outsole view of the Flex Air grey trainer showing the supportive tread pattern
Top and outsole views of the Flex Air grey wide fit trainer
    Three-quarter view of the Flex Air navy wide fit trainer with leather and textile upper
    Side view of the Flex Air navy wide fit trainer showing breathable textile panels
    Front view of the Flex Air navy trainer showing its wide and deep toe shape
    Rear view of the Flex Air navy trainer with a structured leather heel
    Top view of the Flex Air navy lace-up trainer with perforated leather lining
    Outsole view of the Flex Air navy trainer showing the supportive tread pattern
    Top and outsole views of the Flex Air navy wide fit trainer
    Three-quarter view of the Flex Air grey wide fit trainer with leather and textile upper
    Side view of the Flex Air grey wide fit trainer showing breathable textile panels
    Front view of the Flex Air grey trainer showing its wide and deep toe shape
    Rear view of the Flex Air grey trainer with a structured leather heel
    Top view of the Flex Air grey lace-up trainer with perforated leather lining
    Outsole view of the Flex Air grey trainer showing the supportive tread pattern
    Top and outsole views of the Flex Air grey wide fit trainer
Three-quarter view of the Flex Air navy wide fit trainer with leather and textile upper
Side view of the Flex Air navy wide fit trainer showing breathable textile panels
Front view of the Flex Air navy trainer showing its wide and deep toe shape
Rear view of the Flex Air navy trainer with a structured leather heel
Top view of the Flex Air navy lace-up trainer with perforated leather lining
Outsole view of the Flex Air navy trainer showing the supportive tread pattern
Top and outsole views of the Flex Air navy wide fit trainer
Three-quarter view of the Flex Air grey wide fit trainer with leather and textile upper
Side view of the Flex Air grey wide fit trainer showing breathable textile panels
Front view of the Flex Air grey trainer showing its wide and deep toe shape
Rear view of the Flex Air grey trainer with a structured leather heel
Top view of the Flex Air grey lace-up trainer with perforated leather lining
Outsole view of the Flex Air grey trainer showing the supportive tread pattern
Top and outsole views of the Flex Air grey wide fit trainer

Flex Air – Men's Wide Fit Orthopedic Trainers (TDO 609.14-M)

Regular price
GBP 179.00
Sale price
GBP 179.00
Regular price
GBP
Tax included. Free UK delivery on footwear
Do you have a medical condition?
Color Navy
Size
Width Fitting

Flex Air brings a lighter, sport-inspired look to the trusted Flex platform. Built on the same wide and deep 4E K last, it combines soft calf leather in key areas with breathable textile panels through the midfoot.

Inside, a perforated leather lining helps air circulate while maintaining a smooth leather surface around the foot. The three-layer construction pairs the upper with adaptive smart foam and the leather lining for cushioned everyday comfort.

  • Wide and deep 4E fitting on the K last
  • Soft calf leather and textile upper
  • Perforated leather lining for improved breathability
  • Three-layer comfort construction with smart foam
  • Roomy toe box
  • Removable insole with space for personal orthotics
  • Semi-rigid sole and stable grip outsole
  • Lace-up fastening

Two insole options: Each pair comes with two sets of removable insoles: a standard 10 mm set and a slimmer 6 mm set. If the fit feels snug, switch to the 6 mm set to create around 4 mm of extra internal space for a roomier fit.

Available in Navy and Grey, Flex Air is designed for men who want the supportive fit of Flex in a more relaxed, sporty style.

  • Back Pain
  • Bunions
  • Corn
  • Diabetics
  • Flat Feet
  • High Arches
  • Knee Pain
  • Men
  • Metatarsalgia
  • Morton`s Neuroma
  • Plantar Fasciitis
  • Suitable For Orthotics
  • Swollen Foot
  • Upper: Soft calf leather with breathable textile panels through the midfoot
  • Lining: Perforated seam-free leather
  • Cushioning: Smart foam layer beneath the upper
  • Depth: Deep K last, with roughly 4 mm of height adjustable via the two insoles
  • Fitting: Wide and deep 4E, built on the K last
  • Closure: Lace-up
  • Sole: Semi-rigid EVA sole with a grip tread; firm heel and arch, limited forefoot flex
  • Insoles: 10 mm insole (arch support, metatarsal dome) fitted; 6 mm slim insole supplied; both removable

  • Clean the leather sections of Flex Air 609.14-M with a lightly damp cloth, taking care not to saturate the adjacent textile.
  • Use polish only on the calf leather and keep wax, cream and conditioning products away from the ventilated fabric panels.
  • Once the textile is dry, loosen surface dust with a soft brush rather than scrubbing or machine washing it.
  • Start with measured indoor wear so the leather components and lacing can settle without overloading the mixed-material upper.
  • Give this ventilated trainer time to air between uses, especially after a warm day or extended wear.
  • Avoid downpours, snow and immersion; should the pair become damp, loosen the laces and leave it to dry naturally away from heat.
  • Remove the footbed pair in use when airing the shoes, and keep the alternative pair clean, dry and flat.
  • Try the size and chosen insole combination on a clean indoor floor before taking the shoes outside.

  • Free tracked shipping with delivery in 2 working days.
  • Hassle-free returns and exchanges within 30 days.
  • Return postage costs are the customer’s responsibility.

Flex Air wide fit orthopaedic trainers with labelled fit and construction features

Class I Medical Device · Podiatrist Recommended

Flex Air 609.14-M: Ventilated Inside and Out

Choose Flex Air 609.14-M when the K-last fit of Flex suits you but you would prefer ventilated textile through the midfoot. Its two removable footbeds provide a practical choice of internal depth for different socks or a compatible orthotic.

Perforated Leather Lining
The lining is perforated leather, adding ventilation openings while maintaining a leather surface against the foot.
Textile Through the Midfoot
Breathable panels sit between the calf leather toe and heel, providing ventilation through the sides of the upper.
Wide, Deep, 4E
UK 7 to 12.5, with the same broad, tall toe box as the Flex 609-M.
Three-Ply Upper
Calf leather and textile outer, smart foam mid-layer, perforated leather lining. The memory foam adapts as feet swell during the day, while the breathable, antibacterial layers help manage moisture and odour.
Choose Your Insole
One deep contoured footbed and one slim 6 mm insole, about 4 mm of depth apart; either comes out for a personal orthotic.
Supportive Sole with Grip
The moulded sole has a treaded outsole beneath the leather-and-textile trainer upper. The heel and arch stay firm for support, while the forefoot allows a small amount of flex.

FAQs

1
How can TDO Therapy shoes help with foot problems?

TDO Therapy shoes are designed to provide enhanced comfort, support and protection for a wide range of foot needs. Whether you are looking for greater everyday comfort or footwear to accommodate changing foot shape, swelling, orthotics or other foot-related concerns, our shoes combine carefully considered features to support easier, more comfortable movement. Our range includes different fits and constructions for people who need more room, adjustability or flexibility than conventional footwear may provide.

  • Triple-Layer Technology: Our unique triple-layer construction combines natural leather, cushioning memory foam and a soft inner lining. It adapts to the feet throughout the day, providing lasting cushioning, comfort and protection against rubbing and pressure.
  • Even Pressure Distribution: The orthopaedic sole helps distribute pressure more evenly across the foot, reducing stress on sensitive areas.
  • Comfortable, Accommodating Fit: Wider fittings, adjustable fastenings, removable footbeds and deeper designs offer different ways to accommodate individual fitting requirements and compatible orthotics.
  • Breathable Natural Leather: Soft, breathable leather encourages airflow, helping feet remain cool and comfortable.
  • Shock Absorption: The cushioned sole helps soften impact and support more comfortable walking.
  • Removable Insoles: Insoles can be removed or replaced with custom orthotics where required.
  • Seamless Interior: A smooth interior helps minimise friction and irritation against sensitive skin.
  • Antibacterial Protection: Antibacterial-treated materials help maintain a fresher and more hygienic environment inside the shoe.
2
What is our shipping and returns policy?

After placing your order, you will receive a confirmation email indicating that our fulfilment team has received it. Once your order is ready for shipment, we will send an email with tracking details.

You may return your order within 30 days of purchase, except for custom-made items. If you choose to cancel, you may do so without providing a reason, but the undamaged items must be returned to our business premises at your expense.

A refund for the price of the returned goods will be issued promptly, excluding any separate delivery charges.

Please note that this policy does not apply to defective goods, and worn footwear, either indoors or outdoors, cannot be refunded or replaced.

3
Do You Offer VAT Relief for Disabled Customers?

Yes, VAT relief may be available for individuals who are chronically sick or disabled. To qualify, customers must have a long-term physical or mental condition that affects everyday activities, or a medical condition recognised as a chronic sickness under HMRC guidelines.

Temporary injuries and non-medical fitting requirements do not qualify for VAT exemption.

Eligible products must be for personal use, or if purchased on behalf of someone else, that person must qualify for VAT relief and the products must be solely for their use.

False declarations may result in penalties under HMRC regulations.

To apply for VAT relief:

  • Complete your purchase at the full listed price
  • Leave a note for our team during checkout
  • Download and complete the VAT Relief Declaration form
  • Email the signed form to our team
  • Once approved, we will refund the VAT amount to your original payment method

For full information and to download the official HMRC VAT Relief form, please visit:

VAT Relief Information Page

4
Which Fitting is Right for Me?

If you're unsure about the perfect fit, refer to our fitting guide for additional guidance or feel free to contact us for further assistance.

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