The SIGMA road bike helmet is KPLUS’s special tribute to its 10th anniversary! The name SIGMA, derived from the mathematical symbol Σ meaning “sum,” perfectly embodies the exquisite craftsmanship and core values KPLUS has honed over the past decade.

SIGMA’s design not only bears the unique mark of KPLUS’s 10th anniversary but also features a groundbreaking internal ventilation channel system within the helmet shell. After countless wind tunnel tests and precise adjustments, the design achieves the ultimate in airflow and cooling efficiency. The streamlined ventilation channels ensure that air passes through efficiently during movement while maintaining excellent heat dissipation. SIGMA strikes the perfect balance between maintaining minimal weight and ensuring safety.

Put on the SIGMA now and embark on your journey of self-discovery on the road!

 

Not only lightweight, but also evolved.

Silver ion antibacterial deodorizing strap

The strap is woven with silk threads infused with silver ions, utilizing the properties of silver ions to disrupt the cell walls of pathogens, completely dismantling bacterial growth and preventing unpleasant odors after intense exercise.

Safety in an instant

FIDLOCK® Magnetic Buckle

Featuring the high-quality, powerful magnetic buckle patented by FIDLOCK® from Germany, it allows for easy one-handed operation. This enhances the feel while wearing it and makes taking it off more convenient.

New generation, new experience

K2 Head Lock Adjustment System

The new generation K2 head lock adjustment system features added cushioning lining and carefully designed angles on the protective wings, making it more conforming to the head's curves while wearing. The adjustment positions are clearly marked, greatly enhancing comfort.

Breathable coolness, ultimate comfort

Slow-rebound memory foam

The Coolmax® technology fabric creates an excellent experience of cool breathability, while the slow-rebound inner foam is suitable for any head shape and size, providing a perfectly personalized wearing comfort.

Thoughtful details

Anti-slip glasses pads

Each side of the front wind channel is equipped with anti-slip pads for glasses, allowing you to securely hang your favorite riding sunglasses, so you can easily adjust your riding style without worrying about where to store your accessories.

uncompromising safety standards

Passed European CE and Taiwan CNS safety inspections

The product meets the European international safety standard (CE-EN1078) and has been certified by Taiwan's National Standards (CNS) for safety testing, providing you with the most reliable protection to face challenges fearlessly.

 

Smooth and unimpeded, ultimate breathability

Aerodynamic wind tunnel testing

Under the wind tunnel testing at the brand's experimental center, the arrangement and size of the holes in the cap are repeatedly adjusted to pursue the ultimate airflow and heat dissipation performance.