The Science Behind FlowCore
The Principle
Archimedes' Principle of Fluid Dynamics
In 250 BC, Archimedes discovered that fluid moves to the area of least resistance and greatest need. When pressure is applied to one point in a contained fluid, that pressure is transmitted equally in all directions.
This is the exact principle inside every ArchGlide FlowCore™ insole. The liquid glycerin inside the sealed TPU chamber responds to pressure from your foot by flowing to the areas that need support most. It's not programmed. It's not mechanical. It's physics.
"Fluid moves to the area of least resistance and greatest need."
Archimedes, 250 BC
Step by Step
What Happens Inside Your Shoe
With Every Step
Heel strike
When your heel hits the ground, your body weight creates a high-pressure zone under the heel. The glycerin is pushed forward toward the arch and ball of the foot, cushioning the impact before it reaches your ankles, knees, and spine.
This is why ArchGlide reduces joint impact. The liquid absorbs and redistributes force that would otherwise travel straight up your skeleton.
Midfoot transition
As your weight shifts forward through the stride cycle, the glycerin flows with it. Your arch, which is typically unsupported by flat insoles, is now filled from below by liquid that self-levels to match your exact anatomy.
No two feet are the same. Even your left and right foot have different arches. Liquid adapts to both automatically. Rigid orthotics cannot.
Toe push-off
When you push off your toes, the glycerin flows back toward the heel, preparing for the next step. This continuous cycle creates a massaging action that boosts circulation in the foot with every single stride.
Clinical studies on glycerin insoles show circulation to the feet and lower extremities can be significantly increased during use.
Repeat, forever
Unlike foam that compresses permanently after the first few hundred steps, liquid cannot be compressed. The glycerin performs identically on step 1 and step 1,000,000. There is no break-in period and no breakdown period.
This is why ArchGlide outlasts 3-4 foam insoles. The material itself is immune to the forces that destroy every other insole on the market.
Material Science
Why Every Other Material Fails
EVA Foam
Dead in weeks
Compresses permanently under body weight within 2-4 weeks
Once compressed, provides zero cushioning
Absorbs moisture, breeds bacteria
Must be replaced monthly
Solid Gel
Flattens over time
Deforms under sustained pressure over 1-3 months
Cannot flow or adapt to foot shape
Static cushioning only, no circulation benefits
Traps heat, makes feet sweaty
Rigid Orthotics
One shape, one shoe
Molded at one moment, but feet change daily
Only fits one shoe, $300-800 each
Support but zero cushioning
Can create new pressure points
Liquid Glycerin
Alive, always
Cannot compress, identical on day 1 and day 365
Self-leveling, adapts to every foot in every shoe
Continuous micro-massage boosts circulation
Natural thermal insulator for all seasons
The Material
What Is Glycerin?
Glycerin (also called glycerol) is a naturally occurring compound found in all animal and vegetable fats. It is a thick, clear, odorless liquid that is completely non-toxic and hypoallergenic. The FDA classifies glycerin as Generally Recognized as Safe (GRAS). You encounter glycerin every day in food, skincare, toothpaste, and pharmaceutical products.
What makes glycerin ideal for insoles is its viscosity. It is 50 times more viscous than water, which means it flows slowly and heavily rather than splashing. This density provides cushioning and support that water or thin fluids cannot.
Construction
Three Layers.
Engineered Together.
Top Layer
Woven polyester fabric
Breathable, moisture-wicking surface that sits against your foot. Soft to the touch, durable under friction. Machine washable.
Core
Sealed TPU chamber with liquid glycerin
The heart of FlowCore™. A thermoplastic polyurethane bladder filled with 100% pure food-grade liquid glycerin. Pressure tested and reinforced at all seams.
Base
TPU structural base
Provides the structural foundation. Thin enough to fit any shoe (6mm total), rigid enough to maintain the chamber's shape under load.
Conditions
How FlowCore™ Addresses
Common Foot Conditions
Plantar Fasciitis
The glycerin's continuous flow stretches and releases tension on the plantar fascia, replicating the effect podiatrists recommend. The more you wear them during the day, the better your feet feel in the morning.
Heel Pain & Heel Spurs
Liquid distributes body weight away from the heel's pressure point. Instead of concentrated force on a hard surface, glycerin disperses it across the entire foot.
Diabetic Neuropathy
The massaging action of flowing glycerin significantly increases blood circulation to the feet. Neuropathy is a circulatory condition, and increased circulation is one of the primary therapeutic approaches.
Lower Back, Knee & Hip Pain
Foot misalignment cascades upward. By equalizing pressure at the foot level, ArchGlide corrects the foundation that affects posture, gait, and joint stress throughout the body.
General Foot Fatigue
Standing on hard surfaces causes fatigue because feet absorb repeated impact without recovery. Glycerin's shock absorption reduces cumulative impact load on your feet, ankles, and legs.
Flat Feet & Fallen Arches
Because glycerin is self-leveling, it fills the arch gap from below regardless of how low your arch is. Unlike rigid supports that assume a universal arch height, the liquid adapts to your anatomy.
The Foot Pain Epidemic
ArchGlide FlowCore™ insoles are wellness products designed for comfort and support. They are not medical devices and are not intended to diagnose, treat, cure, or prevent any disease or medical condition. These statements have not been evaluated by the FDA. Individual results may vary. If you have a serious medical condition, consult your healthcare provider before using this product.