In the latest installment of Insole Wars, we subjected six popular insoles to a 5-joule impact test to evaluate their shock absorption capabilities. This test simulates the force experienced during everyday walking, providing insights into each insole’s performance.
We also tried a 25 joules sports impact test and they almost broke our machine
🧪 Test Overview
The 5-joule impact test measures the peak force transmitted through each insole when subjected to a standardized impact. Lower kilonewton (kN) readings indicate better shock absorption, which is crucial for reducing foot fatigue and preventing injuries.
📊 Test Results
Insole Model | Peak Force (kN) | Price |
---|---|---|
Dr. Scholl’s Gel Insoles | 12,000 | $18 |
Z-Liner Insoles | 6,000 | $39 |
FP Kingfoam Insoles (5mm) | 3,400 | $19.99 |
FP Kingfoam Elite FluidX Insoles | 2,700 | $39.99 |
FP Kingfoam Orthotics FluidX | 1,700 | $49.99 |
FP Kingfoam Orthotics FluidX Hi | 2,000 | $60 |
🔍 In-Depth Analysis
Dr. Scholl’s Gel Insoles
Despite being a household name, Dr. Scholl’s Gel Insoles registered the highest peak force, indicating limited shock absorption. While affordable, they may not provide adequate protection for high-impact activities.
Z-Liner Insoles
Offering better performance than Dr. Scholl’s, Z-Liner Insoles showed moderate shock absorption. However, at a higher price point, they may not offer the best value for those seeking superior impact protection.Amazon UK+1Touch of Modern+1
FP Kingfoam Insoles (5mm)
These insoles demonstrated significant improvement in shock absorption, making them a cost-effective choice for enhanced comfort during daily activities.
FP Kingfoam Elite FluidX Insoles

With advanced FluidX technology, these insoles further reduced peak force, offering better protection for more active lifestyles.
FP Kingfoam Orthotics FluidX
Achieving the lowest peak force in the test, these orthotic insoles provide exceptional shock absorption, ideal for individuals engaged in high-impact sports or those requiring additional foot support.
FP Kingfoam Orthotics FluidX Hi
While slightly higher in peak force than the standard orthotics, the ‘Hi’ version offers enhanced arch support and is optimized for action sports impacts, balancing comfort and performance.
🏁 Conclusion
The FP Kingfoam Orthotics FluidX series outperformed competitors in shock absorption, making them a top recommendation for individuals seeking maximum foot protection. While Dr. Scholl’s and Z-Liner offer basic support, the advanced technology in FP insoles provides superior comfort and soreness/injury prevention.
Note: Prices are subject to change and may vary by retailer.