NOTE: If you’re between sizes round up by half a size!

LENGTH & WIDTH - Our shoes have a
Our shoes offer a slightly narrower fit than typical sneakers and are sized according to the industry-standard Brannock Device®. We currently offer a standard “D” width and do not yet offer wide sizing. If you have a fuller foot or typically wear wide shoes, consider sizing up by half a size. For those who regularly require wide widths, these may feel too snug.

INITIAL FIT - Each pair is fully lined with premium full-grain leather, which may feel snug at first. This is normal, the leather is designed to stretch and mold to your foot over time, creating a custom fit. For best results, treat your shoes regularly with a leather conditioner to keep them soft and flexible. Additionally, our sport insole provides generous cushioning but can be swapped out for a thinner insole if you prefer more room.

FIT COMPARISON - If you're familiar with the Cole Haan ZeroGrand series, you'll find a similar feel in both fit and comfort with our Fibonacci shoes.

Our shoes are built for life in motion. They are designed to move effortlessly from formal settings to everyday wear, without ever sacrificing comfort or style.

Each pair is crafted with full-grain leather and lined with our TempSync™ adaptive climate lining, which regulates temperature to keep your feet comfortable in any season. Beneath the surface, a CushionCore™ silicone layer and sport-grade insoles absorb impact and deliver support that lasts all day.

Every detail has been thoughtfully engineered. From the suede heel cup and reinforced stitching to the high-end wax laces and professional-grade midsoles, nothing is overlooked. Even the outsole is custom-designed for flexibility, grip, and longevity.

At Fibonacci, we believe in timeless design, next-level comfort, and craftsmanship that speaks for itself.