Is it better to size up or down running shorts?

Deciding whether to size up or down running shorts depends on your personal preference for fit, the specific brand’s sizing, and the type of running you do. Generally, a snug but not constricting fit is ideal for optimal comfort and performance.

Sizing Your Running Shorts: The Ultimate Guide

Finding the perfect running shorts can significantly impact your comfort and performance during any run. Too tight, and they might chafe or restrict movement. Too loose, and they could slide down or cause drag. Let’s break down the nuances of whether it’s better to size up or down for your next pair of running shorts.

Understanding Running Short Fit: What’s the Goal?

The primary goal when sizing running shorts is to achieve a balance between freedom of movement and a secure fit. You want shorts that stay put without feeling restrictive. This means they should allow for a full range of motion during your stride, whether you’re sprinting or enjoying a leisurely jog.

Key Fit Considerations:

Waistband Comfort: The waistband should be snug enough to prevent slipping but not so tight that it digs into your skin.
Inseam Length: This affects coverage and potential for chafing. Shorter inseams offer more freedom, while longer ones provide more protection.
Leg Opening: A well-fitting leg opening allows for unrestricted thigh movement.

Should You Size Up or Down for Running Shorts?

The answer isn’t always straightforward and often comes down to personal preference and brand variation. However, there are general guidelines to consider.

When to Consider Sizing Down

If you find a pair of running shorts that are slightly too large in the waist but fit well elsewhere, sizing down might be a good option. This is especially true if the shorts have an adjustable drawstring.

Loose Waistband: If the shorts consistently slide down your hips, a smaller size will likely fix this.
Chafing Prevention: Shorts that are too baggy can sometimes bunch up and cause friction. A size down might offer a smoother fit.
Streamlined Feel: Some runners prefer a more form-fitting feel for reduced drag and a sense of being unencumbered.

Example: You try on a size Medium, and the waistband feels a bit loose, but the leg length and overall feel are good. If a Small fits snugly at the waist without being tight and the rest of the fit remains comfortable, sizing down is a viable choice.

When to Consider Sizing Up

Conversely, there are situations where sizing up is the better choice. This is often the case if your measurements fall between two sizes or if you prioritize comfort and a less restrictive feel.

Tight Waistband: If the waist is uncomfortably tight in your usual size, sizing up will provide relief.
Thigh Restriction: If the shorts feel tight around your thighs or restrict your stride, a larger size can offer more room.
Layering: If you plan to wear a base layer or compression shorts underneath, sizing up ensures adequate space.
Specific Fabric Types: Some technical fabrics, like those with a lot of spandex, can feel tighter. Sizing up might be necessary for a comfortable fit.

Example: You typically wear a Large, but the shorts feel restrictive around your quads during your stride. Trying on an XL reveals a much more comfortable range of motion, and the adjustable waistband allows you to cinch it for a secure fit.

Brand Variations and Sizing Charts

It’s crucial to remember that sizing can vary significantly between brands. A Medium in one brand might fit like a Large in another. Always consult the brand’s specific sizing chart before making a purchase.

Tips for Using Sizing Charts:

Measure Accurately: Use a soft measuring tape to measure your waist and hips.
Compare Your Measurements: Match your measurements to the chart provided by the manufacturer.
Read Reviews: Other runners’ feedback on sizing can be invaluable. Look for comments about whether the shorts run true to size, small, or large.

The Importance of Inseam Length

Beyond waist and hip fit, the inseam length plays a vital role. This refers to the length of the fabric from the crotch seam to the bottom hem of the shorts.

Short Inseams (1-3 inches): Offer maximum freedom of movement, ideal for sprinting and trail running where you need to navigate obstacles. They can sometimes lead to chafing for some runners.
Medium Inseams (4-6 inches): A popular all-around choice, providing a good balance of coverage and mobility.
Long Inseams (7+ inches): Offer more coverage and can be preferred by runners who want more protection against the elements or chafing.

What About Built-in Liners?

Many running shorts come with built-in liners. These often serve as underwear, wicking away moisture and preventing chafing. The fit of the liner can influence your overall perception of the shorts’ size.

Snug Liner: If the liner feels tight, it might make the entire short feel smaller.
Loose Liner: A liner that’s too loose might not provide adequate support or moisture-wicking.

Consider how the liner fits when deciding whether to size up or down. Some runners even opt to remove liners and wear their own preferred underwear.

Practical Examples and Scenarios

Let’s look at a few common scenarios:

Scenario 1: The "Almost Perfect" Fit: You love the fabric and features of a particular short, but the waist is just a tad loose. If the inseam and thigh fit are good, sizing down is likely your best bet, especially if there’s a drawstring.
Scenario 2: The "Restrictive Stride": You’ve purchased shorts that feel fine when standing still, but during your run, they feel tight around your quads, limiting your stride. In this case, sizing up will provide the necessary room for a comfortable and efficient gait.
Scenario 3: The "In-Between" Measurement: Your waist measurement falls into a Medium, but your hip measurement is closer to a Large. Check the brand’s specific recommendations. Often, it’s better to size up to accommodate the larger measurement and then use a drawstring to secure the waist.

Comparison of Sizing Approaches