How Kaia Gerber Defined the UGG Ultra Mini & Leggings Trend

On March 9, 2021, Kaia Gerber was photographed in Los Angeles, offering a clear look at the enduring “model-off-duty” aesthetic that favors comfort and utility.

While her street style often makes headlines, this specific outing highlights how she integrates cozy, functional footwear into a streamlined fitness wardrobe.

Moving between a Pilates session and the city streets, Gerber demonstrated why the cropped boot remains a staple for transitional weather. Her ensemble balances athletic technical gear with the relaxed silhouette of a classic shearling boot.

Kaia Gerber steps out in UGG Classic Ultra Mini boots, grounding her sleek Gymshark leggings and cropped layers with the cozy, low-cut silhouette that defines off-duty model dressing in Los Angeles on March 9, 2021 (Credit: Instar / WENN)

She wore a pair of gray marl high-waisted Gymshark “Adapt” seamless leggings paired with a “Dylan” ribbed cropped top from Belen. To manage the morning chill, she layered with a Free People “Hit the Slopes” pink fleece jacket.

Many style enthusiasts often debate the visual balance of this pairing: Would you wear UGGs with leggings?

The UGG Ultra Mini’s ankle-baring shaft keeps Kaia’s athleisure look visually light, balancing fitted gray leggings with a plush lavender fleece

Cindy Crawford’s daughter finished the look with Kate Young for Tura “Ivy” sunglasses and a tan-colored Celine “Ava” bag.

Kaia Gerber pairs a plush lavender fleece jacket with a gray cropped top, finishing the look with slim black sunglasses, a black face mask, and a tan shoulder bag tucked under her arm

For her feet, Kaia opted for UGG’s Classic Ultra Mini chestnut boots, which she wore with white ankle socks—a styling choice that has become a signature for the brand’s mini-silhouette.

Kaia’s chestnut UGG Ultra Minis paired with scrunched white socks highlight the slip-on ease and relaxed proportions that made the silhouette a 2020s staple

Available at Zappos and Nordstrom, these slip-on boots feature a water-repellent Twinface sheepskin upper. The design includes a sheepskin lining and a footbed lined with UGGplush, set on the brand’s proprietary Treadlite outsole for traction.

UGG’s Classic Ultra Mini is a cozy way to finish just about any outfit

Why the UGG Ultra Mini Still Defines Off-Duty Style

From Pilates runs to everyday errands, Kaia Gerber’s outfit captures exactly why the Ultra Mini remains a go-to: it’s easy, functional, and quietly flattering. The low-cut shaft keeps the leg line open, while the plush shearling adds just enough texture to balance streamlined activewear. It’s this mix of comfort and proportion that continues to make the silhouette a staple in modern athleisure dressing.

As this look shows, the appeal isn’t just about staying warm—it’s about creating a relaxed, wearable uniform that moves effortlessly between workouts and the street. If you’re drawn to this cozy-meets-polished formula, the edits below explore how the UGG Mini family continues to evolve across celebrity wardrobes and everyday styling.