Diemme Boots Sizing Guide: How to Get the Right Fit Before You Order

Quick answer

Diemme boots generally fit true to your usual European size, but the last and sole change the feel: the Roccia Vet Gomma runs roomy, while the Marostica Low and Cornaro Low sit closer. Measure your foot in the afternoon, compare it to the size chart, and size up for thick socks or a wider forefoot.

Diemme builds its boots and sneakers on different lasts, so the same size number can feel different from one style to the next. That is why buying Diemme boots online works best when you start from your measured foot length rather than the size on an old pair from another brand.

This guide walks through how the main Diemme shapes fit, which models give you more room, and how to decide between two sizes when you are on the fence.

How to measure your foot before you order

Stand on a sheet of paper with your heel against a wall and mark the tip of your longest toe, then measure that distance in centimeters. Do this in the afternoon or after walking, when your feet are at their largest, and measure both feet, using the longer one for sizing.

Compare that centimeter measurement to the size chart on each product page, not to a US or UK size you remember from another brand. Diemme lists sizes in EU, and the conversion can shift by half a size depending on the last. If you are between two sizes, the style and sock you plan to wear decide the call.

• Measure in the afternoon, when feet are largest.
• Use the longer foot for your size decision.
• Compare centimeters to the product page chart, not to another brand's label.

How different Diemme styles fit

The Roccia Vet Gomma is built on a lightweight platform sole with a tonal rubber rand and rubber mudguard, and it runs roomier through the forefoot than the low-top styles. That extra volume is useful if you wear thicker socks or have a wider foot, but it can feel loose if you are used to a close-fitting sneaker.

The Marostica Low, Diemme's first sneaker, has a sharper low-top silhouette with a chunky, robust grippy sole. It sits closer to the foot than the Roccia Vet, so most people stay with their measured size rather than sizing down. The Cornaro low hiker sits between the two: weatherproof, wax-treated suede over a lightweight lugged rubber sole, with a fit that works for easy hikes and everyday wear.

• Roccia Vet Gomma: roomier, good for thick socks or wider feet.
• Marostica Low: closer fit, stay with your measured size.
• Cornaro: middle ground for in-between seasons.

Socks, insoles, and break-in

Sock thickness changes fit more than most people expect. A thin liner sock can free up half a size, while a thick hiking sock can fill the room in a Roccia Vet Gomma. If you plan to wear the boots mostly in cold weather, measure with the socks you will actually use.

Leather and suede uppers relax slightly with wear, especially across the instep, but they do not stretch in length. If the boot feels tight at the toes out of the box, a larger size is the safer choice. If it feels snug across the top of the foot but the length is right, it will usually settle after a few wears.

• Measure with the socks you plan to wear.
• Length will not stretch; width and instep may relax slightly.
• Toe pressure out of the box means size up.

What to check when the boots arrive

Try boots on at the end of the day, on a hard floor rather than carpet, and walk a few steps. Your longest toe should sit about a thumb's width from the front, and your heel should stay put without slipping. If the heel lifts more than slightly, the size is likely too large.

Check the width across the ball of your foot and the pressure over the instep. Diemme boots come with an extra set of laces on some styles, so you can adjust the lacing tension to fine-tune the fit before deciding. Keep the tags and box until you are sure, since that makes any exchange simpler.

• Try on at the end of the day, on a hard floor.
• Aim for a thumb's width at the toe and a stable heel.
• Keep tags and box until you are sure.

Decision rules for choosing your Diemme size

• If you are between two sizes: Size up for the Roccia Vet Gomma and Cornaro, which have more volume, and stay with your measured size for the Marostica Low. When in doubt, the roomier style is the safer size up.
• If you have a wide forefoot: Choose the Roccia Vet Gomma or Cornaro over the Marostica Low, which has a closer low-top silhouette. Pick the last that matches your foot shape, not just the size number.
• If you wear thick socks: Measure with those socks on and consider the Roccia Vet Gomma, which has more room through the forefoot. Sock thickness can change your size by half a step.

Product facts that affect fit

• Roccia Vet Gomma Black Leather M: Built on a lightweight platform sole with a tonal rubber rand and rubber mudguard, and designed for everyday movement in the city. The roomier platform shape suits thicker socks and wider feet, but can feel loose if you prefer a close fit.
• Marostica Low Black Nappa Platform W: Hand-crafted in the Diemme factory in Veneto from Italian leather, with a clean low-top silhouette and chunky, robust grippy soles made by another Italian family-owned business. The closer low-top fit means most people should stay with their measured size rather than sizing down.
• Cornaro Deep Forest Suede M: Inspired by traditional low-top hiking boots, with weatherproof, wax-treated suede and a lightweight lugged rubber sole for easy hikes and everyday wear. A middle-ground fit that works for in-between seasons, so sock choice has less impact than on the Roccia Vet.

Who this sizing approach suits

Best for

• Shoppers buying Diemme boots or sneakers online for the first time
• Anyone between two sizes who wants a clear rule instead of guessing
• People who wear thicker socks or have a wider forefoot

Not for

• Shoppers who already know their exact Diemme size from a previous pair
• Anyone looking for a style-specific fit review of a model not listed here

Measure your foot in centimeters, match it to the size chart on the product page, and let the style decide the rest: roomier for the Roccia Vet Gomma and Cornaro, closer for the Marostica Low. That is the most reliable way to get Diemme boots sizing right before you order.