What Makes PU a Versatile Insole Material?
PU insole foam is not one fixed material structure. Its density, cell structure, softness, rebound, and compression behavior depend on the formulation and manufacturing route. PU can be engineered for supportive molded insoles, breathable open-cell constructions, slow-recovery comfort layers, and lighter-weight programs.
PU is often selected for support and compression resistance, but it should not be described as automatically denser or longer-lasting than every EVA. Premium EVA and supercritical EVA can outperform ordinary PU in weight, rebound, or durability. FX Footwear evaluates the complete brief—including target weight, hardness, cushioning, wear life, cost, and footwear construction—before recommending a material platform.
FX Footwear is a footwear-material manufacturer with more than 20 years of experience across China, Vietnam, and Indonesia. We apply PU material technology to insole development, molding, testing, and volume production. PowerFrame is our PU insole series.
The PowerFrame PU Insole Range
PowerFrame Support
Lightweight poured PU
Process upgrades reduced a typical pair from 0.32 to 0.18 g/cm³ and from 108 to 80 g/pair—28 g less per pair—while maintaining a soft underfoot feel. Lower material use can also reduce raw-material cost and product carbon footprint.
PowerFrame Cloud
Open-cell PU, including poured variants
A light, springy comfort option for lifestyle and everyday footwear programs requiring airflow and soft step-in feel. The production route follows the approved formula.
PowerFrame Airy
Recycled open-cell PU
An open-cell construction developed for airflow, moisture management, and soft underfoot comfort, with recycled content documented by project.
PowerFrame Bio
Bio-based PU options
PU options using DuPont™ Susterra® or Huafon bio-based polyol. Formula, verified bio-based content, manufacturing route, and performance are confirmed for each footwear program.
PowerFrame Fit
Slow-recovery comfort PU
A conforming comfort option for footbeds that require a soft, pressure-distributing feel and controlled recovery.
PowerFrame PU Insole Specifications
| Series | Technology | Common hardness (Asker C) | Common density (g/cm³) | Common resilience | Common compression set |
|---|---|---|---|---|---|
| PowerFrame Support | Poured PU | 28 C | 0.18 / 0.32 | 35% | 12% |
| PowerFrame Cloud | Open-cell PU, including poured variants | 18 / 25 C | 0.16 / 0.18 | 30–35% | 10–12% |
| PowerFrame Airy | Recycled open-cell PU | 25 C | 0.16 | 30% | 10% |
| PowerFrame Bio | Bio-based PU | 22 / 25 C | 0.18 / 0.28 | 30% | 12% |
These are common series-level reference values, not universal guarantees. PowerFrame Fit remains part of the range but is not forced into this Asker C table because its memory-PU specifications use Shore F hardness and recovery time. Final specifications depend on the formula, thickness, top cover, footwear construction, test method, and production brief. Full technical data sheets and project-specific lab test reports are available on request.
How to Select a PU Insole Solution
For work, outdoor, and all-day footwear requiring a supportive platform, PowerFrame Support combines a soft underfoot feel with a lightweight PU upgrade. The updated reference build is 28 g lighter per pair than the previous version and can reduce material use, raw-material cost, and associated product carbon footprint.
For breathable step-in comfort, PowerFrame Cloud and PowerFrame Airy provide open-cell options with different weight and cushioning targets. For sustainability-led programs, PowerFrame Bio can incorporate verified plant-derived polyol content; the exact content and manufacturing route are documented for the approved formula.
For a plush, conforming footbed, PowerFrame Fit provides controlled slow recovery. If lower weight or higher rebound is the leading requirement, FX can also compare EVA insoles and supercritical foam insoles. The recommendation follows the finished footwear requirement rather than a blanket material ranking.
FX Footwear is a footwear-material manufacturer that turns PU material and process technology into finished insoles ready for sampling and mass production. Our work covers formulation matching, insole engineering, molding, testing, quality control, and multi-country volume supply.
FX Footwear is a footwear-material manufacturer that turns PU material and process technology into finished insoles ready for sampling and mass production. Our work covers formulation matching, insole engineering, molding, testing, quality control, and multi-country volume supply.
Lower-Impact PU Options, Verified by Project
FX Footwear develops lightweight PU and offers bio-based- and recycled-content options where the approved formulation supports them. PowerFrame Support's updated reference build reduces density from 0.32 to 0.18 g/cm³ and pair weight from 108 to 80 g/pair. Using 28 g less material per pair can reduce raw-material cost and the associated product carbon footprint while maintaining a soft feel. Content, process, and environmental claims are confirmed with project-specific supplier and test documentation.
PU Insole FAQs
What are the advantages and trade-offs of PU insoles?
PU can be formulated for support, soft step-in comfort, airflow, slow recovery, and compression resistance. Its trade-offs depend on the exact formula and construction: some PU solutions are heavier or more expensive than standard EVA, while lightweight PU technology can narrow that gap. Performance must be compared using the finished insole specification and the same test method.
Which is better, a PU insole or an EVA insole?
Neither material is universally better. PU is often chosen for supportive or comfort-focused constructions, while standard EVA is frequently selected for low weight and cost. High-grade EVA and supercritical EVA may outperform ordinary PU in rebound, weight, or durability. FX Footwear recommends the platform that fits the footwear brief and validates it through sampling and testing.
How long do PU insoles last?
There is no single service-life figure for all PU insoles. Wear life varies with formulation, density, thickness, footwear construction, use conditions, and the comparison EVA grade. Project-specific compression-set and wear testing provide a more reliable basis than claiming that every PU insole lasts longer than every EVA insole.
What is PU insole material made of?
Polyurethane is produced from reactive components that form a polymer network. By adjusting the formulation and manufacturing process, PU can be developed for supportive, open-cell, slow-recovery, lightweight, or bio-based-content insole solutions. Not every PU formula uses the same cell structure or molding route.
Can FX open-cell PU be evaluated as an alternative to OrthoLite® insoles?
Yes. FX open-cell PU can be evaluated for footwear programs considering an alternative insole solution, but suitability depends on the target breathability, cushioning, durability, weight, cost, compliance requirements, and approved benchmark. FX Footwear does not claim universal equivalence to, endorsement by, or affiliation with OrthoLite®.
