Lululemon Speed Up Shorts 2.5 vs. 4: Which size is right for you?

The Lululemon Speed Up 2.5" Shorts and the 4" version offer identical high-performance features but differ by 1.5 inches in length. This seemingly small distinction creates two very different experiences: the 2.5" offers an athletic, minimal-coverage fit for maximum mobility, while the 4" provides more modest coverage that boosts versatility for both workouts and casual wear.

Here's everything you need to know to choose the right Lululemon inseam for your needs.

Lululemon Speed Up High-Rise Lined Short 2.5"

The Speed Up 2.5" is the shorter, sportier option in the lineup, designed for runners and athletes who prioritize freedom of movement and a lightweight feel. This short sits high on the thigh, offering a snugger fit and a look that’s focused purely on performance and minimal friction during intense activity.

• What it is: A high-rise, lined running short with a 2.5-inch inseam designed for minimal coverage and maximum mobility.
• Key features: High-rise waistband for support, lightweight sweat-wicking fabric, built-in liner, flatlock seams to prevent chafing, and a hidden waistband pocket.
• Price: $58
• Materials/Construction: Made from Lululemon’s lightweight and breathable Everlux fabric, which is quick-drying and designed for high-performance exercise.
• Sizing/Fit: True to size but designed to be snug and form-fitting. It's an ideal choice for athletic or slender builds who prefer a close-to-body feel.
• Pros: Excellent for running in hot weather, offers maximum freedom of movement, provides a sleek and athletic aesthetic, and feels incredibly lightweight.
• Cons: The minimal coverage can feel too revealing for some, less versatile for casual wear outside the gym, and can be less comfortable for those with curvier thighs.

This is the short for the dedicated athlete who wants the most aerodynamic and least distracting option for running or high-intensity training sessions.

Shop this product: shop.lululemon.com/p/women-shorts/Speed-Up-Shorts-2.5-Inseam

Lululemon Speed Up High-Rise Lined Short 4"

The Speed Up 4" inseam is the more versatile, all-around performer of the two. It provides noticeably more coverage and a slightly more relaxed fit while maintaining all the technical features needed for a great workout. This added length makes it comfortable not just for running, but also for gym sessions, yoga, and running errands afterwards.

• What it is: A high-rise running short with a 4-inch inseam that provides moderate coverage suitable for a wide range of activities.
• Key features: Shares the same features as the 2.5” version, including the high-rise waistband, Everlux fabric, liner, hidden pocket, and chafe-free seams.
• Price: $58
• Materials/Construction: Built with the same durable, sweat-wicking Everlux fabric, ensuring identical quality and performance.
• Sizing/Fit: Offers a bit more room and a more forgiving fit compared to the shorter version, making it suitable for a wider variety of body types, including those with fuller builds.
• Pros: Offers great coverage for modesty and security, highly versatile for both fitness and daily wear, provides a comfortable fit for more body types, and is less likely to feel restrictive.
• Cons: The extra fabric may feel slightly warmer in very hot conditions, and some runners may prefer the more minimal feel of the shorter version for speed work.

This is a perfect do-it-all athletic short for anyone seeking a balance between high performance and modest, practical coverage.

Shop this product: shop.lululemon.com/p/women-shorts/Speed-Up-Shorts-4-Inseam

Lululemon Speed Up 2.5" vs. 4" Shorts Comparison

Coverage & Length

The core difference is the 1.5 inches of fabric. The Speed Up 2.5" sits very high on the thigh, offering a look similar to traditional running shorts seen in track and field. This minimal coverage is excellent for keeping cool and allowing complete leg freedom.

In contrast, the Speed Up 4" provides mid-thigh coverage for most people, offering security and modesty. It reduces concern about exposure during stretching, squats, or sitting down, making it a more practical choice for everyday activities.

Fit & Comfort

Both inseams offer incredible comfort thanks to the Everlux fabric and thoughtful construction, but the fit feels different. The 2.5" version has a distinctly snugger and more athletic fit, designed to stay close to the body during rapid movement. It’s tailored for those who prefer minimal fabric.

The 4" version, while still form-fitting, offers slightly more room through the leg opening and seat. This fit is often more comfortable for individuals with curvier or more muscular builds and for anyone who simply prefers a short that isn't quite as tight against the skin.

Materials & Construction

There is no difference in quality between the two lengths. Both are made from Lululemon's high-performance Everlux fabric, which is known for being breathable, quick-drying, and durable. They feature identical details like the high-rise waistband, hidden pocket, reflective accents, and flatlock seams. Your choice here is purely about length and fit, not material or build quality.

Price & Value

Both the 2.5" and 4" Speed Up shorts are priced at $58, meaning there is no cost difference between them. The value comes down to how you plan to use them. If you need a specialized short for competitive running, the 2.5" offers performance value. If you need a daily athletic short that can handle a run, a gym workout, and a trip to the store, the 4" offers far more versatility and practical value.

Versatility

The 4" inseam is the clear winner in versatility. Its moderate coverage makes it appropriate for a wide variety of public settings, from fitness studios and trails to coffee shops and casual outings. The 2.5" short is more specialized. While excellent for its intended purpose - running and intense workouts - its minimal coverage makes it less suitable for activities where modesty is a factor.

Which One Should You Choose?

Both are great performance shorts, but they serve different needs and preferences.

Choose the 2.5" inseam if:

• You prefer a minimal, athletic look and feel.
• You prioritize maximum freedom of movement and breathability for running.
• You workout in hot climates and want as little fabric as possible.
• You have a more slender or petite frame and find longer shorts feel bulky.

Choose the 4" inseam if:

• You want more coverage for peace of mind during squats, lunges, and stretches.
• You are looking for one pair of shorts that works for workouts and casual wear.
• You have a curvier or taller build and prefer a longer inseam for comfort.
• You value versatility and want a reliable, do-it-all athletic short.

Frequently Asked Questions

What's the main difference between Speed Up 2.5" and 4" shorts?

The only difference is the inseam length, which is 2.5 inches versus 4 inches. This alters the amount of skin coverage on the thigh. The 2.5" is more revealing and athletic, while the 4" is more modest and versatile.

Do Lululemon Speed Up shorts run true to size?

Yes, they generally run true to size. However, they are designed with an athletic fit. If you are in between sizes or prefer a slightly looser, more relaxed fit, consider sizing up.

Which length is better for running?

This is a personal preference. Many serious runners prefer the 2.5" shorts for their lightweight, minimal feel, especially for races or speed work. Others prefer the security and coverage of the 4" shorts for everyday training runs.

Can you wear Speed Up shorts for things other than running?

Absolutely. They are excellent for gym workouts, HIIT classes, and general training. The 4" version is particularly versatile and easily transitions to casual wear for errands or walks.

Do Speed Up shorts have a built-in liner?

Yes, both versions of the Lululemon Speed Up shorts feature a lightweight, built-in liner for comfort and coverage.

Do these shorts ride up when you're working out?

All shorts have some potential to ride up depending on body shape and activity. However, the liner helps keep them in place. The 4" length tends to be more secure, while the shorter 2.5" length may experience more movement during high-impact exercises like squats.

What fabric are the Speed Up shorts made of?

They are made from Lululemon's Everlux fabric. It is a four-way stretch, sweat-wicking material that dries quickly and feels smooth against the skin, making it perfect for intense workouts.

How should I wash my Lululemon Speed Up shorts?

Lululemon recommends washing their garments in cold water with similar fabrics and line drying or tumbling dry on a low setting. This helps maintain the integrity of the high-performance fabric and its technical features.