If you’ve ever slipped into a piece of clothing and felt instantly held, supported, and styled, chances are it was Lululemon’s Define Jacket Nulu. Known as the ultimate fusion of performance wear and everyday fashion, this lightweight zip-up has developed a near cult-like following in the fitness and athleisure communities. And for good reason.
This isn’t just a jacket—it’s your second skin. From yoga class to airport terminals, dog walks to dinner dates, the Define Jacket is universally flattering, breathable, and irresistibly soft. The Nulu version takes things one step further, crafted from Lululemon’s signature fabric that feels like butter on the body.
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Why the Define Jacket Nulu Has a Cult Following
There are jackets, and then there’s the Define Jacket. Its legacy in the Lululemon lineup speaks volumes: loved by personal trainers, yogis, jet-setters, and style influencers alike, this jacket has become synonymous with elevated activewear that doesn’t scream “gym clothes.”
So what’s the hype about?
- Flattering, sculpted seams that hug your waistline and define your silhouette
- Thumbholes and cuffins that keep hands warm or sleeves in place
- A hip-length hemline that elongates the torso and layers easily
- Breathability and stretch, allowing for full range of motion in workouts or while on the move
Its popularity goes beyond aesthetics. It’s the piece you wear to warm up in Pilates, but keep on through errands and into brunch, and still look effortlessly polished.
The Nulu upgrade brought a new layer of obsession. With Lululemon’s “naked sensation” fabric, it now delivers support without structure, softness without sag, and compression that never feels tight.
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Fabric & Fit: The Buttery Soft Feel of Nulu
The hero of the Define Jacket Nulu is, without question, the Nulu fabric.
What is Nulu?
It’s Lululemon’s proprietary fabric designed to deliver their iconic “naked sensation”—a feel so smooth, you forget you’re wearing it. Engineered for low-impact workouts like yoga, Nulu is:
- Extremely lightweight
- Four-way stretch
- Sweat-wicking and breathable
- Exceptionally soft to the touch
When used in the Define Jacket, Nulu creates a fit that’s tailored but never tight, snug but never restricting. The jacket contours to your body like a glove, yet feels invisible during wear.
Fit Breakdown:
- Slim through the body with strategic seam lines to enhance curves
- True to size, though some opt to size up for a roomier feel
- Hip-length hem offers full coverage and flatters your midsection
- Available in extended sizing (0–20), accommodating a wide range of body types
If you’ve ever struggled to find a jacket that doesn’t bunch at the back, ride up when you move, or feel boxy in photos—the Define Nulu fixes all of that. It’s the ideal blend of soft structure and feminine form.
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Design Details That Make a Difference
When it comes to elevated activewear, Lululemon has mastered the art of refinement through functionality—and the Define Jacket in Nulu fabric is a shining example. More than just a flattering fit and buttery-soft texture, this jacket is a precision-crafted layering piece with features that blend seamlessly into your life, whether you’re heading to class, commuting, or just looking effortlessly polished.
Everything in the Define Jacket is deliberately designed—from the curvature of the seams to the angle of the zippered pockets. This isn’t style for style’s sake; it’s performance wear disguised as street chic, delivering both form and function in equal measure.
Signature Features That Set It Apart:
- Thumbholes for extra coverage: Not only do they help keep sleeves in place during movement, but they also offer a sleek hand-covering option when temps dip—ideal for chilly morning walks or post-gym cool-downs.
- Cuffins (cuff + mittens): Lululemon’s clever convertible cuffs fold over your hands to act like mittens. It’s a subtle but genius touch that adds warmth without the bulk of gloves.
- Two hidden zippered pockets: Discreetly placed for minimal visual impact, these pockets are roomy enough for essentials—like your key fob, lip balm, or credit cards—yet lie flat for a smooth silhouette.
- Full-length zipper with zipper garage: Say goodbye to neck or chin irritation. The zipper garage tucks the pull away neatly at the collar, offering a polished finish and added comfort when fully zipped.
- Mesh venting under arms and back: These targeted zones enhance airflow where you need it most, preventing overheating during activity and keeping you feeling fresh during transitions from indoors to out.
Even the smallest elements, like the low-profile zipper pulls, flat seams, and inner paneling, are chosen to create a jacket that feels refined and fuss-free. No unnecessary bulk, no uncomfortable stitching—just clean lines and a body-contouring fit that moves with you.
Available Colors: Everyday Neutrals + Eye-Catching Limited Editions
Lululemon knows that versatility starts with color, and the Define Jacket Nulu doesn’t disappoint. The brand consistently releases this bestseller in a rotating palette of core and seasonal shades, so you can collect it in your favorite hues or discover something fresh each season.
Expect to find:
- Core classics like Black, Navy, and White Opal—timeless, clean, and endlessly wearable.
- Seasonal standouts like Sonic Pink, Java, Chambray Blue, or Pink Peony—perfect for injecting a little color into your capsule wardrobe.
Each shade is saturated, rich, and beautifully wearable, making it easy to transition this jacket from activewear essential to an integral part of your everyday uniform.
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How It Performs: From Studio to Street
This jacket isn’t just for looks—it’s made to move. Whether you’re stretching, flowing, or sprinting to your gate, the Define Jacket Nulu is built to perform across scenarios.
In the Studio:
- Light enough for layering over a sports bra or tank
- Allows full mobility for yoga, barre, or Pilates
- Helps warm up quickly without overheating
On the Street:
- Flatters without looking “sporty”
- Pairs beautifully with leggings, joggers, jeans, or skirts
- Works as a standalone top or under puffer vests, trench coats, or hoodies
- Perfect for transitional weather or climate-controlled environments
It’s not a winter coat and doesn’t try to be—it’s that perfect middle layer you wear nine months out of the year. It keeps you warm in AC, comfortable outdoors, and always photo-ready.
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Who Should Buy It: Athletes, Loungers & Style Seekers
The Define Jacket Nulu isn’t just for athletes. Its versatility makes it ideal for anyone who values:
- Comfort that doesn’t sacrifice shape
- Style that adapts from morning errands to evening plans
- Soft, breathable layers that feel amazing against skin
- Effortless style with technical performance
Ideal For:
- Yoga lovers needing a light top-layer
- Pilates & barre regulars who want warmth before/after class
- Travelers and commuters looking for comfort on the go
- Busy professionals who love a piece they can dress up or down
- Anyone with sensory sensitivities (Nulu’s softness is unmatched)
It’s also a must-have for layering aficionados—the way it fits under outerwear without bulk makes it a smart buy for year-round wardrobes.
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Final Verdict: A Worthy Wardrobe Investment
If you’re building your dream activewear wardrobe, the Define Jacket Nulu is a non-negotiable. It’s one of those rare pieces that blends technical design with elevated styling, and delivers on comfort, fit, and performance every single time you put it on.
Yes, it’s a premium price point—but with Lululemon’s quality, long lifespan, and timeless silhouette, you’re investing in a wear-on-repeat staple that will pay for itself in compliments and confidence.
Whether you’re chilling, training, or traveling, the Define Jacket Nulu is the layer that will move with you, flatter you, and keep up with your lifestyle—without sacrificing softness or sophistication.
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FAQ: Define Jacket Nulu by Lululemon
1. Is the Define Jacket Nulu true to size?
Yes. Most people wear their usual Lululemon size. However, if you prefer a looser fit or want to layer thicker pieces underneath, consider sizing up.
2. What’s the difference between the original Define and the Nulu version?
The original Define is made with Luon (more compressive and structured), while the Nulu version is softer, stretchier, and designed for light activity or everyday wear.
3. Can I work out in the Define Nulu?
Yes—for low-impact movement like yoga, walking, or stretching. For high-impact or sweat-heavy workouts, opt for a technical fabric like Luxtreme instead.
4. Is it machine washable?
Absolutely. Wash on cold, avoid fabric softener, and hang or lay flat to dry. The Nulu fabric holds up beautifully with proper care.
5. Will it pill or fade over time?
Nulu is durable but delicate. Avoid heavy friction (like crossbody bags or rough Velcro) and you’ll enjoy long-lasting wear.
6. Does it wrinkle easily?
Nope! The Define Nulu is low-maintenance and travel-friendly. Just roll it up in your carry-on and go.
7. Is it worth the price?
In short—yes. With its flattering cut, cloud-soft fabric, and multipurpose use, it’s one of Lululemon’s most iconic investments for a reason.
