In the fast-growing world of performance eyewear, few names stand out the way Altalist KAKU Series does. Designed for athletes who demand clarity, comfort, and reliability on every ride or run, the KAKU line has become one of Altalist’s most celebrated collections.
Blending minimalist weight, advanced lens engineering, and a fit that adapts effortlessly to different face shapes, KAKU is built for those who want more than just sunglasses; it’s gear you can trust from the first kilometer to the last.
Loved by cyclists, runners, and outdoor enthusiasts across ASEAN, the KAKU Series proves that high-performance eyewear doesn’t have to compromise between style and function.
With color variants that elevate your look, customizable comfort, and full prescription-lens compatibility, it’s no surprise this series has turned into a top choice among both competitive athletes and everyday endurance lovers.
From race-focused models to lifestyle-ready designs, the KAKU lineup continues to expand, refining what lightweight performance truly means.
What Makes the KAKU Series So Popular?
The KAKU sunglasses Series didn’t become Altalist’s best-selling lineup by accident; its popularity is built on a combination of thoughtful engineering, athlete-driven design, and everyday practicality.
Each sunglasses model is crafted to deliver a clear vision, a stable fit, and long-wear comfort across running, cycling, and outdoor activities. Here’s what sets the KAKU Series apart:
1. Featherweight Construction for All-Day Performance
Every KAKU model is engineered with an ultra-light frame that minimizes pressure on the nose and ears, allowing athletes to move freely without distraction. Whether pushing hard on climbs or logging miles under the sun, the lightweight feel supports long-duration comfort and reduces fatigue, one of the strongest reasons users keep returning to the series.
2. Advanced Lens Technology for Any Light Condition
KAKU lenses are designed to maintain clarity across diverse environments. Depending on the model, riders and runners benefit from:
- Polarized lenses that cut glare on open roads and bright surfaces
- Photochromic or dimmable lenses that adapt to changing light conditions
- High-contrast optics that sharpen road textures, trail contours, and movement. This versatility gives athletes confidence in both urban and off-road settings, ensuring stable visibility regardless of the weather or time of day.
3. Adjustable Fit & Superior Comfort
The KAKU Series emphasizes customizable comfort through adjustable nose pads and flexible temples. This design accommodates different face shapes, staying stable when sprinting, climbing, or navigating uneven terrain.
Even after hours of wear, the frames remain secure without pinching or slipping, a key factor for cyclists and runners who demand uninterrupted performance.
4. Style That Matches Any Personality
Beyond functionality, the KAKU Series is known for its wide range of color options. From bold race-inspired tints to clean, understated tones, users can choose a style that matches their kit, helmet, or daily outfit. The result is performance eyewear that feels premium without losing its personal appeal.
5. Prescription Lens Compatibility
For athletes requiring vision correction, KAKU models offer seamless prescription lens compatibility. This sunglasses feature expands its audience beyond competitive riders to commuters, casual runners, and lifestyle users, allowing everyone to enjoy the full benefits of Altalist lens technology.
The KAKU Series Models
The KAKU Series consists of four core models, each shaped by user feedback and real-world riding needs. While the design direction of each model differs, they all share Altalist’s focus on clarity, stability, and lightweight performance.
1. KAKU SP1 Polarized — Compact & Lightweight for Racers
The SP1 is built around a compact lens design that suits riders who prefer a smaller, more race-focused profile. It is one of the lightest models in the KAKU lineup, making it appealing for cyclists who want minimal frame presence on the face.
Specifications:
- Compact race-style shape: SP1 uses a slightly smaller lens size, giving it a sharp, streamlined look often preferred in competitive road riding.
- Lightweight construction: The frame and lens combination are designed to feel light and unobtrusive, ideal for long-duration use.
- Polarized lens option: SP1 is available with a polarized lens, providing clearer visibility in bright outdoor environments.
This model suits riders who want eyewear that sits close to the face, feels extremely light, and reduces glare on sunny roads. Its compact shape also blends well with smaller helmets or riders who prefer a tighter, minimal look.
2. KAKU SP2 — Large Field of View + Photochromic Option
The SP2 is characterized by its large lens coverage and the availability of a 2in1 mirror photochromic and VIV20 lens option, which automatically adjusts to light conditions and optimize the experience of details in fast moving surrounding.
Specifications:
- Wide field of view: SP2 uses a larger single-lens design that expands peripheral vision.
- 2in1 Mirror Photochromic/dimmable and VIV20 lens option: This lens can transition based on brightness, making it suitable from low-light to intense sunlight.
- Stable comfort: The reference emphasizes comfort and all-use stability.
The SP2 is ideal for riders who prefer maximum visibility, especially in environments where lighting changes frequently, such as passing through forested routes, coastal areas, or early-morning training. The added coverage offers a sense of openness without increasing weight or bulk.
3. KAKU SP4 — Ultralightweight, Comfortable, Interchangeable Lens
The SP4 as Altalist’s first frameless design, focusing on lightweight design but with a full-shield lens that offers both style and extended coverage.
Specifications:
- Interchangeable lens: Modular design for choosing different lens matching with environment. You’ll get clear photochromic lens and miror lens in the box.
- Full-shield style lens: This provides broad facial coverage for protection from wind and sunlight.
- Ultra lightweight frame & temples construction: Despite the larger lens area, SP4 remains impressively light.
- Comfort-oriented design: The lineup highlights SP4 as a model built for ease of use and long-wear comfort with three different thickness nose pads and soft temples are designed to reduce pressure
SP4 is often preferred by riders and runners who want a modern frameless design without the weight typically associated with large-lens eyewear. It feels comfortable over long distances and offers a clean, contemporary appearance that pairs well with modern helmets and sportswear.
4. KAKU LS2 — Twin-Lens Design for Everyday Lifestyle Use
The LS2 stands out as the lifestyle-focused member of the KAKU family, using a twin-lens structure rather than a single shield lens.
Specifications:
- Twin-lens / dual-lens design: Unlike the SP models, LS2 uses two separate lenses, giving it a casual, lifestyle-oriented look.
- Lifestyle positioning: The model is marketed for everyday use, not just hardcore cycling.
- Stylish color variations: The reference highlights LS2’s visual appeal through multiple color options.
LS2 is designed for users who want Altalist quality but in a form that fits daily outfits, commuting, casual riding, or light activities. The twin-lens design creates a softer, easygoing appearance, making it more wearable off the bike while still offering the comfort Altalist is known for.
Conclusion
The KAKU Series has earned its place as Altalist’s best-selling eyewear lineup for a reason. Each model delivers a distinct blend of comfort, clarity, and modern design, allowing cyclists, runners, and active users to choose the fit that matches their style and performance needs.
Whether it’s the compact, race-oriented feel of the SP1, the expansive visibility of the SP2, the lightweight full-shield design of the SP4, or the casual versatility of the LS2, every option reflects the same commitment to quality that has made the series so widely trusted.
Proven by countless athletes across the region, the KAKU Series is a reliable choice for anyone looking to invest in their first pair of cycling or running sunglasses. With models that balance function and style effortlessly, Altalist ensures that every user can enjoy clear vision and lasting comfort, no matter where the road or trail leads.
Read also: How to Pick the Right Sports Eyewear?
