For optimal performance, ensure you select the correct size, allowing a thumb's width of space between your longest toe and the end of the shoe. Properly lace your shoes to achieve a secure, yet comfortable fit that doesn't restrict circulation. The New Balance 520v9 is primarily compatible with road surfaces, including asphalt, concrete, and track. While they offer good grip, extreme wet conditions or uneven trails may not offer the same level of performance or protection. To care for your shoes, always refer to the product label for specific instructions. Generally, spot clean the engineered mesh upper and rubber sole with a mild soap and a soft brush or cloth. Avoid machine washing or drying, as this can damage materials and adhesives. Allow them to air dry away from direct heat or sunlight. Regular cleaning helps maintain breathability and traction.