Size Up or Down? How to Choose When Between Sizes

The General Rule

When in doubt, size up. A slightly roomy shoe can be adjusted with thicker socks or insoles, while a shoe that's too tight will be uncomfortable from day one and can cause foot problems over time.

When to Size Up

Size up in these situations:

• Running shoes and athletic shoes — your feet swell during exercise.
• Boots and hiking shoes — extra room for thick socks and toe movement on descents.
• Shoes you'll wear all day — feet swell with prolonged standing and walking.
• If you plan to use thick insoles or orthotics.
• If you have wide feet and wide-width options aren't available.

When to Size Down

Size down (or stick to the smaller size) when:

• Dress shoes and formal shoes — a snug fit looks and feels better.
• Climbing shoes and specialized sports shoes — precision matters.
• If the shoe material will stretch (leather stretches, synthetic usually doesn't).
• If there's excessive heel slippage at the larger size.

Tips for Half-Size Decisions

If you're between sizes:

• Try both sizes if possible — walk around the store for at least 10 minutes.
• Check that you have about a thumb's width of space between your longest toe and the front of the shoe.
• Make sure the widest part of your foot aligns with the widest part of the shoe.
• Consider the return policy if buying online — order both sizes if possible.
• Remember that different brands size differently, so your "between size" may only apply to that brand.