How to Buy Boots Online: Shaft Height, Calf Width and Return Rules (What to Check)

Boots are one of the hardest things to buy online. On top of the usual shoe size, you have to get the shaft height, calf width, heel and foot width right, and a pair that fits your foot can still gap at the knee or refuse to zip over your calf. This guide covers which measurements to take, how to read boot listings, how styles differ in fit, and the return rules worth checking before you order.

Take four measurements before you shop

Measure in the afternoon, when feet are slightly larger, wearing the socks or tights you plan to wear with the boots:

• Foot length: stand on paper, mark the heel and the tip of your longest toe, and measure the distance. Compare it with the brand's size chart rather than relying on your usual size.
• Foot width: measure across the ball of the foot, the widest part of the forefoot.
• Calf circumference: measure around the widest part of your calf while sitting with your foot flat. If you will wear jeans tucked in, measure over them.
• Shaft height: measure from the floor at your heel up to the point where you want the boot to end, such as below the knee for a knee-high boot.

Understand shaft height

Shaft height is usually measured from the top of the heel area (or the arch) to the top of the boot, not including the heel itself. Rough categories:

• Ankle boots and booties: about 4 to 7 inches.
• Mid-calf: about 8 to 12 inches.
• Knee-high: about 13 to 16 inches.
• Over-the-knee: 18 inches and up.

Shaft height is often given for one size, typically a women's 6 or a men's 9, and rises slightly with each size. If you are petite, a knee-high shaft may hit the back of your knee and dig in when you sit; if you are tall, it may land mid-calf. Compare the listed shaft with your own measurement, and remember that a heel raises the whole boot on your leg.

Check calf width carefully

Calf circumference is the measurement that most often decides whether a tall boot works. Many brands offer standard, wide and extra-wide calf versions, but the labels are not standardized. One brand's wide calf may be several inches roomier than its standard, while another's is only half an inch wider. Look for the actual calf circumference on the product page and the size it is measured on. For a comfortable fit, aim for a circumference about half an inch to an inch larger than your calf, or more if you will tuck in jeans. Stretch back panels, elastic gores and adjustable buckles add some give, while a stiff leather shaft with a full zip has little. Wide calf also usually refers only to the shaft, not to a wider foot. For an example of a retailer that lists shaft height and calf circumference on each tall boot, see our ALDO review.

Match the style to your foot

Different boot types fit differently:

• Chelsea boots pull on with elastic sides, so they need a snug heel to avoid slipping. They are hard to adjust if your instep is high.
• Lace-up boots are the most adjustable, which helps narrow or high-volume feet.
• Zip boots are easy to put on but only as roomy as the zip allows.
• Pointed, snip and almond toes taper, and many people need a half size up for toe room. Square and round toes are more forgiving.
• Heeled boots push the foot forward. Over 3 inches, check that the shaft and calf still fit when your foot is angled.

If a brand lists no widths, assume a medium (B for women, D for men) and read reviews or ask customer service before ordering if your feet are wide.

Read the materials and sole

Leather and suede stretch slightly and mold to the foot, so a snug fit can loosen over a few wears. Synthetic uppers and patent finishes barely stretch, so buy them in the size that fits from the start. Suede needs a protective spray before rain or snow. Look at the sole too: rubber with a lug or tread grips better on wet pavement than a smooth sole. Padded or foam insoles add comfort, but check whether they are removable if you use orthotics. If you will wear the boots in snow or slush, look for the words waterproof or water-resistant in the listing rather than assuming leather will keep water out, and check whether the sole is stitched or glued, since a stitched sole can usually be replaced by a cobbler.

Know the return rules before you try them on

Boot returns are often stricter than they look. Before ordering, check:

• The return window and whether it counts from purchase or delivery
• Whether mailed returns carry a fee, and whether store returns are free
• Whether exchanges are possible online or only in store
• Which items are final sale, especially clearance
• That the box and tags must be kept and the soles unmarked

Try boots on indoors on carpet, and walk and sit in them for a few minutes before deciding. Scuffed soles usually void a return.

A quick checklist

• Measure foot length, foot width, calf circumference and desired shaft height
• Compare foot length with the brand's chart and note its sizing advice
• Check the listed shaft height and calf circumference, and the size they are measured on
• Choose a closure and toe shape that suit your feet
• Check upper material, stretch panels and sole grip
• Read return windows, fees, exchange options and final-sale rules
• Try on indoors and keep the box and tags