Direct answer
Boots Fit by Foot Shape
Foot shape changes boot fit as much as foot length does. A wide foot needs a wide width boot, a narrow foot needs a narrow width or a lace up boot that can be tightened, a high arch needs room at the instep, and a low arch needs a footbed that supports the whole foot. Start from your foot length, then match the width and the instep to your shape. Use the Boots Size Calculator with your foot width to get a starting size for your shape.
Narrow feet in boots
A narrow foot slides side to side in a regular width boot, and the foot lifts at the ankle with every step. That lifting rubs the back of the foot and makes the boot feel clumsy, even when the length is right. A narrow width boot holds the foot in place, and a lace up boot can be tightened across the instep to take up the extra room.
When you try boots with a narrow foot, check the sides of the foot first. You should not be able to slide a finger down the side of the foot inside the boot with ease, and the foot should not move sideways when you stand on one leg. A thicker sock or an insole can help a boot that is only slightly wide, but a boot that is a full width too wide will never feel secure.
Regular feet in boots
A regular foot fits the standard width that most boots are built for, so the choice is usually about length and calf rather than width. Check toe room first, then instep hold, then calf fit, and the standard width will usually do the rest. Regular feet still vary, so a boot that fits one regular foot may pinch another, because lasts differ between brands.
Do not assume a regular foot needs no width check. Try the boot with the socks you will wear, walk on a hard floor, and feel for pressure across the ball of the foot. A regular foot in a boot with a slim last can feel narrow, and a regular foot in a boot with a roomy last can feel loose, so the brand last matters as much as the width label.
Wide feet in boots
A wide foot needs a wide width boot, not a longer boot. Going up a size to gain width adds length too, and the foot slides forward, the arch support sits in the wrong place, and the toes hit the front on downhill steps. A wide width in the right length holds the foot back and gives the ball of the foot room at the same time.
Leather stretches a little in width, so a wide foot in a leather boot that feels snug but not painful may become comfortable after a few weeks. A wide foot in a boot made from a material that does not stretch has no such hope, so the fit must be right on day one. Check the width with thick socks, because they add the most bulk across the ball.
High arches in boots
A high arch lifts the middle of the foot, so the instep sits higher inside the boot and the top of the boot can press down on it. A boot with a roomy instep, a lace up front that can be loosened, or a removable insole that can be swapped for a thinner one will suit a high arch better than a fixed zip boot with a low instep.
When you try boots with a high arch, bend the knee and walk, and feel for pressure on the top of the foot. The pressure should be even and mild, not a single hard point. A boot that presses the instep when you stand will press harder when you walk, because the foot flexes and the arch rises with each step.
Low arches and flat feet in boots
A low arch spreads the foot wider when you stand, so a low arched foot often needs a wider boot than its length alone suggests. The footbed should support the whole foot, and the boot should not let the foot roll inward with each step. A boot with a firm footbed and a heel counter that holds the rear of the foot steady suits a low arch well.
Try boots for a low arch with your usual insole or orthotic in place, because the insole takes up room inside the boot and changes the fit. A boot with a removable insole gives you the space to fit the orthotic without sizing up, and a lace up boot lets you adjust the hold as the foot settles into the footbed.
A longer second toe and other shape points
A second toe that is longer than the big toe changes where the boot must have room. The longest toe sets the length, so measure to the tip of the second toe when it is the longest, and check that it has about a thumb width of room in front. A pointed toe boot will press a long second toe sooner than a rounded toe boot in the same size.
Other shape points matter too. A bunion needs room at the side of the big toe joint, a hammer toe needs height above the toes, and a wide heel needs a boot whose rear holds without rubbing. In each case, the fix is a boot shape that matches the foot, a wider width, a rounded toe, or a stretchy material, rather than a different length.
Boots sizing tool
Use the Boots Size Calculator
Enter your foot length and foot width in the calculator to get a starting boot size matched to your foot shape.
Frequently Asked Questions
Do wide feet need a larger boot size?
No. A wide foot needs a wide width in the right length, not a longer boot that lets the foot slide forward.
What boots suit a narrow foot?
A narrow width boot, or a lace up boot that can be tightened across the instep to hold the foot in place.
What boots suit a high arch?
A boot with a roomy instep, a lace up front, or a removable insole that can be swapped for a thinner one.
Should I try boots with my orthotic in place?
Yes. The orthotic takes up room inside the boot, so the fit must be judged with it in, not without it.
Does a longer second toe change my boot size?
It changes where you measure. Measure to the tip of the longest toe, and make sure that toe has room in front.