What makes the Mid-Flex unique?

The Mid-Flex balances firmness and flexibility, ideal for moderate activity.

Who should choose the Mid-Flex?

Customers who want strong support but with more support than the Flex.

Is the Mid-Flex good for athletic activities?

Yes, it’s suitable for gym workouts, walking, and light sports.

Does the Mid-Flex fit in dress shoes?

It can fit some dress shoes but works best in sneakers and casual shoes.

Is the Mid-Flex good for plantar fasciitis?

Yes, it helps relieve pressure on the heel and plantar fascia.

Can the Mid-Flex replace Strengtheners?

No, it maintains alignment but does not provide the same corrective strength.

Is the Mid-Flex comfortable right away?

Yes, most people find the break-in period shorter than with Strengtheners.

Does the Mid-Flex help with knee or hip pain?

Yes, by supporting proper alignment, it reduces strain on knees and hips.

Shop Mid Flex Maintainer Arch Supports

This is where flat feet get stronger

If you've been living with flat feet for a while, you'll know that most solutions just take the edge off. The Flat Feet Arch Strengthener is different, it actively works to realign your feet into a better position, targeting the root cause of the problem rather than masking the symptoms.

Because it does the most corrective work, you ease into it gradually. Start with just 30 minutes a day, then build up as your feet grow stronger and your arches learn to hold their position. Most people are wearing it comfortably all day within a few weeks. It works best when part of our three-step system.

What it helps with

Arch collapse and overpronation
Metatarsal support stabilises the midfoot and helps hold the arch in a better position, reducing the inward rolling that flat feet are prone to with every step.

Heel pain and full-body alignment
A stabilising heel cup supports and aligns the heel and ankle, and that alignment ripples upward, potentially easing strain on the knees, hips, and lower back too.

Ball of foot and toe pain
A pronounced metatarsal rise lifts the metatarsal heads to redistribute pressure away from the ball of the foot and toes, reducing the secondary pain that often comes with flat feet.

Overall pressure distribution
Supporting all four arches spreads the load evenly across the foot, so no single point takes the full burden of a flattened arch.

Why our Flat Feet Arch Strengthener works

The firmest support in our three-step system, designed to actively reposition the foot and give flat feet the structure they're missing.
Metatarsal rise and stabilising heel cup work together to unload the forefoot and control the heel simultaneously.
Square waffling underfoot and hex stabiliser at the heel deliver consistent, durable support that holds its shape.
Start with 30 minutes a day and build gradually, your feet are getting stronger and more supported with every wear.
Available in 27 sizes including narrow and wide, so you get a fit that actually fits.
Best worn in enclosed, laced shoes with a removable insole to keep the heel cup secure and working properly.

Where it works best

Work: Mostly standing, standing on hard surfaces, mostly walking
Activities: light daily movement (allow time to adjust before high-impact activity)
Shoes: Trainers, work boots, boots, supportive lace-ups with removable footbeds

At a glance

Flexibility: 4/10
Arch support: 10/10
Shoe versatility: 5/10

27 sizes including narrow and wide

• Limited Lifetime Warranty

• Step-1 Strengthener (first step in our three-support system)

Support That Lasts a Lifetime

At Good Feet, your arch supports are built to last. Unlike insoles or inserts you need to replace every year, our supports come with a Limited Lifetime Warranty. That means no ongoing replacements, no recurring costs, and no compromise on quality. Once you invest in Good Feet, you can count on reliable support for years to come — so you can focus on living, not replacing.