Merrell Size Guide
Merrell is renowned for outdoor footwear and hiking boots engineered for performance and durability. The brand emphasises a true-to-size fit across its ranges, with consistent sizing standards across shoes, sandals, and specialised outdoor footwear. Merrell uses the Mondo sizing system for many styles, where each whole size represents exactly 1 cm in length, ensuring precision when converting between international size standards. Whether you're selecting trail shoes, hiking boots, or outdoor sandals, this guide will help you find your perfect fit across UK, US, European, and Japanese sizing systems.
How to Measure
- Measure your foot length: Place a ruler or measuring tape on a hard, flat surface. Stand with your heel against a wall and measure the distance from the wall to the tip of your longest toe. Record this measurement in centimetres.
- Ensure accurate positioning: Keep your foot flat and upright during measurement. Ask someone to help for greater precision, or use a Brannock device if available.
- Measure both feet: Feet are rarely identical in size. Always measure both feet and use the larger measurement when selecting your size.
- Measure at the end of the day: Feet naturally swell slightly throughout the day and in warmer conditions. Measure in the late afternoon or evening for the most accurate result.
- Check existing footwear: If you own Merrell shoes that fit well, note the size marked inside. Merrell sizing has remained consistent, so this is a reliable reference point.
- Account for socks: Consider the thickness of socks you'll typically wear with your new shoes when determining fit. Outdoor and hiking shoes often require thicker socks for cushioning and support.
Men's Footwear Size Chart
| UK | US | EU | Foot Length (cm) | Japan (cm) |
|---|---|---|---|---|
| 6.5 | 7 | 40 | 25 | 25 |
| 7 | 7.5 | 41 | 25.5 | 25.5 |
| 7.5 | 8 | 41.5 | 26 | 26 |
| 8 | 8.5 | 42 | 26.5 | 26.5 |
| 8.5 | 9 | 43 | 27 | 27 |
| 9 | 9.5 | 43.5 | 27.5 | 27.5 |
| 9.5 | 10 | 44 | 28 | 28 |
| 10 | 10.5 | 44.5 | 28.5 | 28.5 |
| 10.5 | 11 | 45 | 29 | 29 |
| 11 | 11.5 | 46 | 29.5 | 29.5 |
| 11.5 | 12 | 46.5 | 30 | 30 |
| 12 | 12.5 | 47 | 30.5 | 30.5 |
| 12.5 | 13 | 48 | 31 | 31 |
| 13 | 14 | 49 | 32 | 32 |
| 14 | 15 | 50 | 33 | 33 |
| 15 | 16 | 51 | 34 | 34 |
Women's Footwear Size Chart
| UK | US | EU | Foot Length (cm) | Japan (cm) |
|---|---|---|---|---|
| 2.5 | 5 | 35 | 22 | 22 |
| 3 | 5.5 | 35.5 | 22.5 | 22.5 |
| 3.5 | 6 | 36 | 23 | 23 |
| 4 | 6.5 | 37 | 23.5 | 23.5 |
| 4.5 | 7 | 37.5 | 24 | 24 |
| 5 | 7.5 | 38 | 24.5 | 24.5 |
| 5.5 | 8 | 38.5 | 25 | 25 |
| 6 | 8.5 | 39 | 25.5 | 25.5 |
| 6.5 | 9 | 40 | 26 | 26 |
| 7 | 9.5 | 40.5 | 26.5 | 26.5 |
| 7.5 | 10 | 41 | 27 | 27 |
| 8 | 10.5 | 42 | 27.5 | 27.5 |
| 8.5 | 11 | 42.5 | 28 | 28 |
| 9 | 11.5 | 43 | 28.5 | 28.5 |
Men's Sandals Size Chart
| UK | US | EU | Foot Length (cm) | Japan (cm) |
|---|---|---|---|---|
| 6 | 7 | 40 | 25 | 25 |
| 7 | 8 | 41 | 26 | 26 |
| 8 | 9 | 42 | 27 | 27 |
| 9 | 10 | 43 | 28 | 28 |
| 10 | 11 | 44 | 29 | 29 |
| 11 | 12 | 45 | 30 | 30 |
| 12 | 13 | 46 | 31 | 31 |
| 13 | 14 | 47 | 32 | 32 |
| 14 | 15 | 48 | 33 | 33 |
| 15 | 16 | 49 | 34 | 34 |
Women's Sandals Size Chart
| UK | US | EU | Foot Length (cm) | Japan (cm) |
|---|---|---|---|---|
| 3 | 5 | 36 | 22 | 22 |
| 4 | 6 | 37 | 23 | 23 |
| 5 | 7 | 38 | 24 | 24 |
| 6 | 8 | 39 | 25 | 25 |
| 7 | 9 | 40 | 26 | 26 |
| 8 | 10 | 41 | 27 | 27 |
| 9 | 11 | 42 | 28 | 28 |
Kids' Footwear Size Chart
| UK | US | EU | Foot Length (cm) |
|---|---|---|---|
| 9 | 10 | 28 | 16 |
| 10 | 11 | 29 | 17 |
| 11 | 12 | 30 | 18 |
| 12 | 13 | 31 | 19 |
| 13 | 1 | 32 | 20 |
| 1 | 2 | 33 | 21 |
| 2 | 3 | 34 | 22 |
| 3 | 4 | 35 | 23 |
| 4 | 5 | 36 | 24 |
| 5 | 6 | 37 | 25 |
| 6 | 7 | 38 | 25.5 |
Product-Specific Guidance
Trail Shoes & Hiking Shoes
Merrell trail and hiking shoes are engineered for outdoor performance. They typically fit true to size in US measurements. If you fall between sizes, size up rather than down to ensure adequate room for thicker hiking socks and to prevent toe overlap on descents. Check individual product reviews, as some lightweight trail models may fit slightly snug initially but relax after a short break-in period.
Hiking Boots
Hiking and backpacking boots from Merrell generally run true to size. However, they often feature reinforced collars and stiffer midsoles than casual footwear, which may feel firmer initially. Consider sizing up by half a size if you plan to wear thick wool or padded hiking socks, or if you prefer additional room for trekking with heavy loads. Always test boots with the exact sock type and insoles you intend to use.
Outdoor Sandals
Merrell sandals, including models like the Kahuna and Terran, fit true to size. These are designed for comfort over longer distances and feature adjustable straps for a customised fit. If you prefer wearing socks with sandals, you may want to size up slightly, though most wearers find their normal shoe size appropriate.
Socks
Merrell socks are available in standard sizing (S, M, L, XL) based on shoe size ranges. Always refer to the specific sock product chart, as different weights and styles may vary slightly. For hiking, pair your shoes with appropriate sock thickness to ensure your overall foot volume is comfortable.
Sizing Tips
- Refer to Mondo sizing first: Merrell emphasises the Mondo sizing system, where each whole size equals 1 cm of foot length. This is the most accurate way to match your foot measurement to a shoe size, particularly when ordering online.
- Account for terrain and load: Hiking boots used for backcountry trekking with a heavy pack may require more space than day-hike shoes. Consider sizing up half a size if you'll regularly carry weight or walk downhill on technical terrain.
- Break-in period varies by model: Some Merrell shoes require a short break-in period of 1–2 wears, whilst others feel comfortable immediately. Waterproof and insulated models may feel stiffer initially but typically soften as you wear them.
- Shoe width matters: Merrell produces shoes in varying widths, though not all models offer wide fits. If you have particularly wide or narrow feet, check the specific product description or width coding (often marked as B, D, or 2E) rather than relying on sizing alone.
- Sock choice affects fit significantly: Merrell outdoor footwear is designed to accommodate proper hiking socks. Merino wool or technical blend socks (2–3 mm thick) are standard; if you wear thinner socks or go barefoot, your shoe may feel loose. Conversely, very thick cushioned socks may require a half-size up.
- Return within the return window if unsure: Merrell shoes can be returned within the standard return period (usually 30 days) if they don't fit as expected. Order your expected size and try them on at home with proper socks to determine whether an adjustment is needed.
- Women's sizes run smaller than men's in the same EU number: Women's EU 40 is approximately US 9, whilst men's EU 40 is approximately US 7. Always cross-reference both the gender-specific chart and your foot length measurement to avoid confusion.