1. Arch Height Matching
This is the most critical factor—choose insoles that align with your foot’s arch type. For flat feet, pick styles with medium-to-high arch support to lift the arch; for high arches, opt for insoles with targeted arch cushioning to reduce pressure; for normal arches, select "neutral" support to maintain proper alignment. Mismatched arch support can worsen discomfort (e.g., flat feet using high-arch insoles may cause foot pain).
2. Thickness & Shoe Compatibility
Carbon fiber insoles are thicker than ordinary foam insoles (usually 2–5mm). Check your shoe’s internal space first—bulky shoes (e.g., running shoes, work boots) can fit thicker insoles, while slim shoes (e.g., dress shoes, sneakers) need thin, low-profile carbon fiber insoles (2–3mm) to avoid squeezing the feet.
3. Support Strength
Strength varies by product:
• Light support: Suitable for daily commuting (e.g., walking, standing) to ease mild foot fatigue.
• Medium-to-high support: Ideal for athletes (e.g., runners, basketball players) or people with plantar fasciitis—they stabilize the foot and reduce fascia strain.
Avoid overly stiff insoles if you’re new to carbon fiber, as they may feel uncomfortable initially.
4. Fit & Coverage
• Full-foot vs. half-foot: Full-foot insoles offer all-around support (good for overall foot discomfort), while half-foot (heel-to-arch) insoles save space (great for slim shoes but only support the arch/heel).
• Size accuracy: Most insoles are trimmable, but choose the closest size to your shoe size first—excessive trimming may damage the carbon fiber structure.
5. Usage Scenario
• Daily use: Prioritize "lightweight + moderate support" to balance comfort and functionality.
• Sports use: Choose insoles with "enhanced heel cushioning + anti-slip design" to absorb impact and prevent in-shoe sliding.
• Rehabilitation (e.g., plantar fasciitis): Opt for medical-grade carbon fiber insoles (often with ergonomic contouring) recommended by podiatrists.
