Technologies
Innovation at every step — the science behind HKS safety shoes
Signature Technologies
ENERGY-Plugin
Patented SMARTLITE® O LTPU™ foam system that stores kinetic energy with every step and returns it as forward propulsion. 40% lighter than standard soles, 3× energy return.
BOA® Fit System
Micro-adjustable dial closure for a precise, custom fit. One-handed adjustment in seconds — even with gloves on. Backed by a Lifetime Guarantee.
Key Technologies — In Depth
Learn more about the proprietary technologies that keep HKS ahead of the industry.
SMARTLITE® O LTPU™ / ENERGY-Plugin
Patented liquid TPU foam system — 40% lighter than standard PU soles, delivers 3× energy return with every step. Adjustable hardness grades for tailored cushioning. Sustainable: manufactured in Germany, fully recyclable.
- 40% lighter than conventional soles
- 3× energy return propulsion
- Adjustable cushioning hardness
- Recyclable LTPU material
AVALON® GECKO TPU
Inspired by the extraordinary grip of geckos — this innovative TPU sole combines rubber-equivalent slip resistance with 30% lower weight and full recyclability. Extreme abrasion resistance, flexible, and designed for circular economy.
- Rubber-equivalent SRC grip
- 30% lighter than rubber
- Fully recyclable TPU
- Extreme abrasion resistance
BOA® Fit System
Micro-adjustable dial closure for a precise, custom fit in seconds — even with gloves on. Lifetime guarantee. Available across BOLD, NATURAL FIT, ENERGY and other collections.
- One-handed micro-adjustment
- Glove-compatible operation
- Lifetime guarantee from BOA
PXT Membrane
Phalanx Technology membrane — 100% waterproof without compromising breathability or comfort. Temperature-regulated for cold environments. Featured in CROSSMAX Navigator/Adventure PXT.
- 100% waterproof construction
- Full breathability maintained
- Cold-climate thermal regulation
Barefoot-Feeling Technology
Four design pillars — wide anatomical toe box, reduced heel drop, 3D flexible sole, and natural posture support. Strengthens foot muscles, prevents deformities, reduces back and joint strain.
- Anatomical wide toe box
- Reduced heel-to-toe drop
- 3D flexible natural sole
- Promotes long-term foot health
EXTRASHIELD Midfoot Protection
Ergonomically shaped thermoplastic impact guard permanently integrated into the shoe. Absorbs and distributes collision energy across a broad surface. Lightweight, flexible, conforms to foot anatomy without restricting mobility.
- Protects against crush injuries
- Ergonomic TPU construction
- No mobility restriction
All HKS Technologies
01ENERGY-Plugin
Revolutionary SMARTLITE® O LTPU™ foam system delivering the softest running experience ever recorded in safety footwear. The plugin provides superior energy return with every step, reducing fatigue over long shifts.
02BOA® Fit System
The BOA® Fit System uses a micro-adjustable dial closure for a precise, custom fit. Tighten or loosen with one hand in seconds — even with gloves on. Zero pressure points, perfect fit every time.
CROSSMAX All Terrain Grip
The CROSSMAX sole features 5mm multidirectional lugs that grip firmly into wet, muddy, or loose ground. Unmatched traction, superior durability, and designed for maximum performance in demanding outdoor environments.
PXT MEMBRAN
The PXT membrane is a breathable waterproof barrier integrated into the shoe upper. It blocks water molecules from entering while allowing sweat vapor to escape — keeping feet dry from both inside and outside.
05ESD Protection
Electrostatic Discharge (ESD) protection prevents the buildup of static electricity, protecting both the wearer and sensitive electronic equipment. Essential for electronics manufacturing, cleanrooms, and hazardous areas.
Metal-Free Safety
HKS metal-free safety shoes use advanced composite and carbon fiber materials for toe cap and penetration protection — passing all EN ISO 20345 S3 requirements without a single gram of metal. Perfect for security checkpoints and EMF-sensitive environments.
Natural Fit / BFS
The Barefoot Feeling System (BFS) features an anatomically wide toe box that allows your toes to splay and move naturally — improving balance, reducing fatigue, and preventing common foot problems while meeting full S3 standards.
Slip Resistance (SRC)
HKS SRC-rated soles are tested on ceramic tiles with sodium lauryl sulfate solution and on steel with glycerol — the two most demanding slip resistance tests in the industry, ensuring safety on the most treacherous surfaces.
09NANOTECH & MICROTECH Upper
HKS NANOTECH and MICROTECH upper materials use nano-fiber reinforcement for exceptional abrasion resistance, flexibility, and breathability. Lighter than leather, tougher than conventional synthetics.
Ankle Support System
The HKS Ankle Support System uses reinforced side panels and a structured heel counter to prevent ankle rolling injuries — critical for workers on uneven terrain, scaffolding, and construction sites.
EN ISO 20345 Safety Classes
All HKS shoes comply with European safety standards
Basic safety: anti-static, energy-absorbing heel, oil-resistant sole, 200J toe cap
S1 + penetration-resistant midsole (nail protection, 1100N)
S1P in low-cut (ankle-height) shoe design — lightweight & flexible
S1 + water-resistant upper material
S2 + penetration-resistant midsole (1100N) + cleated outsole
S3 protection in a low-cut (ankle-height) shoe design
All-rubber or all-polymer boot: anti-static, energy-absorbing heel
S4 + penetration-resistant midsole + cleated outsole
S3 + fully waterproof (WR) with breathable membrane — highest class
O-Class — Occupational Footwear (No Steel Toe)
Occupational shoe: anti-static, energy-absorbing heel, oil-resistant sole — no steel toe cap
O1 + water-resistant upper material
O2 + penetration-resistant midsole + cleated outsole
Additional Protection Markings
Basic requirement — 200J toe cap, slip resistance
Energy absorption in heel area (min. 20J)
Penetration resistance (midsole, 1100N)
Water resistant upper
Fully waterproof upper (membrane)
Ankle protection
Heat insulation of sole (300 °C)
Cold insulation of sole (−17 °C)
Electrostatic dissipation (EN 61340)
Highest slip resistance — ceramic tile + steel floor tested
Cut resistance of upper material
Heat-resistant outsole (300 °C contact)