Lululemon Instill vs. Define Jacket: Which one should you buy?

The Lululemon Instill Jacket and the Lululemon Define Jacket may seem similar, but they serve different primary purposes. The Instill Jacket is a technical, weather-resistant shell with a slightly relaxed fit, designed for outdoor activity and variable weather, while the Define Jacket is a fitted, soft, and warm layer celebrated for its flattering, second-skin silhouette, perfect for the gym or casual wear.

Here's a detailed comparison to help you choose the right Lululemon jacket for your needs.

Lululemon Instill Jacket

The Instill Jacket is Lululemon's lightweight, versatile solution for active days with unpredictable weather. It shines as an outer layer, blending a sleek, minimalist aesthetic with technical features like water resistance and windproofing without feeling bulky. It offers a clean look and practical performance for commuting, light runs, or grabbing coffee on a misty morning.

• What it is: A lightweight, performance-oriented outer shell designed for transitional weather.
• Key features: Water-resistant and windproof fabric, an adjustable hood, full-length zipper with a protective chin guard, and secure zippered side pockets.
• Price: Around $138.
• Materials/Construction: Composed of technical, four-way stretch fabrics like nylon and polyester blends that protect from the elements while remaining breathable.
• Sizing/Fit: Offers a slightly fitted shape that contours to the body without being restrictive. It fits true to size with enough room for a light layer underneath.
• Pros: Excellent for variable weather, breathable construction prevents overheating, provides a polished and sporty look, and functions well for outdoor workouts.
• Cons: More expensive than the Define Jacket, not designed for deep cold, and offers a less compressive, body-hugging fit.

This jacket is ideal for anyone who needs a reliable, stylish technical shell for battling light wind and rain during outdoor activities or daily commutes.

Shop this product: shop.lululemon.com/p/jackets/Instill-Jacket/

Lululemon Define Jacket

The Define Jacket is an iconic Lululemon piece, famous for its incredibly flattering second-skin fit and soft, comfortable fabric. Designed to hug your curves, it functions as a warm, streamlined layer before, during, and after workouts. It's often worn as a standalone top or light jacket for gym sessions, yoga, running errands, and much more.

• What it is: A classic, form-fitting athletic jacket made from ultrasoft fabric for warmth, stretch, and style.
• Key features: Signature snug fit, a high collar for warmth, and minimal design details that create a clean, streamlined aesthetic. It is made from either Luon or the even softer Nulu fabric.
• Price: Around $118.
• Materials/Construction: Crafted from Lululemon's soft, stretchy, proprietary Luon or Nulu fabrics that prioritize comfort and support.
• Sizing/Fit: Has a very close-to-body fit. While it's true to size for its intended "hugged" feel, many people size up if they want room for layering or simply prefer a less compressive fit.
• Pros: Immensely flattering and stylish silhouette, buttery-soft and comfortable feel, versatile for both active and casual wear, and comes at a more accessible price point.
• Cons: Offers no protection against wind or rain, the tight fit isn't for everyone, and it shows every line of what is worn underneath.

This jacket suits those who prioritize a sleek, body-conscious silhouette and a soft, comfortable layer for workouts or everyday style in cool, dry conditions.

Shop this product: shop.lululemon.com/p/jackets/Define-Jacket/

Lululemon Instill vs. Define Jacket Comparison

Size & Fit

The most immediate difference between the two jackets is the fit. The Define Jacket is famous for its compressive, skin-tight silhouette that hugs your body like a glove. It’s designed to flatter and sculpt, leaving little room underneath. Many shoppers opt to size up for comfort or to accommodate a tank top underneath.

In contrast, the Instill Jacket has a "slightly fitted" shape. It skims the body but offers noticeably more room, making it much better for layering. Thus, its fit feels less restrictive, prioritizing mobility for outdoor activities over a sculpted aesthetic.

Features & Functionality

Functionally, these jackets serve two very different needs. The Instill is all about technical performance in the face of nature. Its water-resistant and windproof materials, coupled with an adjustable hood, make it your go-to defense against drizzle and brisk winds.

The Define Jacket's functionality centers on warmth, comfort, and style. Made from breathable, sweat-wicking Luon or Nulu fabric, it’s meant to be a cozy layer for a cool gym, an early morning run when it's dry out, or simply a fashionable piece for daily errands. It offers no resistance to wind or rain.

Materials & Quality

The materials clearly communicate each jacket's purpose. The Instill Jacket is built from a durable technical fabric with a bit of scrunch to it - a material you'd expect from lightweight rainwear. While smooth, its primary job is protection.

The Define Jacket uses Lululemon's much-loved soft Luon or Nulu fabrics. These materials are known for their cottony-soft hand feel, 4-way stretch, and breathable qualities, prioritizing comfort next to the skin.

Price & Value

At around $138, the Instill comes with a higher price tag. This extra cost covers its technical properties like water and wind-proofing, which require more advanced structural and material design.

The Define Jacket, typically priced around $118, offers strong value as a versatile piece of athleisure that is famously durable and can be worn frequently for both workouts and social activities, assuming your needs are primarily style- and warmth-oriented.

Versatility

The Instill Jacket is versatile in adjusting to varying weather conditions: it’s exceptionally useful for a rainy commute, a windy day, or a morning train ride. Its functional design makes it adaptable.

While less protective from elements, the Define is arguably more versatile in terms of styling. Because it can function as a top, a snug cardigan, or a sleek jacket, it pairs well with a wide variety of bottoms and is worn across most seasons indoors, from post-yoga classes to errands.

Which Jacket to Choose for Your Needs?

Lululemon Instill Jacket

The Lululemon Instill is best for those who seek a true outer layer that protects against the elements. It’s a practical choice for outdoor runners, hikers, or commuters who face a light mist, shower, and breeze regularly. You would choose it if you prioritize functionality and weather resistance over a body-hugging silhouette.

Lululemon Define Jacket

The Define Jacket shines for individuals who value a flattering and polished fit above all. It’s the de facto choice for those seeking a sleek, "pulled-together" look for exercise sessions, yoga classes, running errands, or simply when a cozy warm layer feels ideal. It suits those who prioritize aesthetics, comfort, and style over technical features.