Rumer Willis & Kaia Gerber’s Pilates Style: How to Wear Monochrome Athleisure With Converse

Rumer Willis has mastered the art of monochromatic athleisure, often turning her fitness routines into a masterclass for casual footwear.

During an outing in Los Angeles in April 2021, the actress was spotted leaving a Pilates class with Kaia Gerber, showcasing a vibrant “Amazon Green” ensemble that leaned heavily into the season’s color trends.

Rumer Willis steps out for a Pilates class with Kaia Gerber and a friend in Los Angeles on April 6, 2021, pairing athleisure layers with classic Converse Chuck Taylor high-top sneakers (Credit: Instar / WENN)

Whether she is heading to a private session at Forma Pilates or grabbing a post-workout juice, Willis consistently pairs high-performance leggings with classic, accessible shoes—ranging from iconic Converse high-tops to cozy Birkenstock sandals.

Below, we break down her signature workout style and the specific sneakers she uses to elevate a standard gym look.

Rumer Willis in Amazon Green Converse Chuck Taylor High-Tops

Demi Moore and Bruce Willis’ eldest daughter looked amazing in a head-to-toe green workout outfit. She showcased her shapely legs in a pair of leggings teamed with a matching hoodie.

Rumer Willis embraces a monochrome athleisure look in a green hoodie and matching leggings, finishing the workout outfit with Amazon Green Converse Chuck Taylor high-top sneakers

Elevating her casual athleisure look, the 32-year-old actress accessorized with gold bracelets and an Apple watch. She carried a green water bottle from Frank Green and kept her stuff in a black croc skin bag.

With her long, natural curly raven tresses worn loose, Rumer highlighted her eyes with mascara and eyeliner. She then stayed low-key and safe by covering her mouth and nose with a plaid face mask.

Rumer Willis wears her long, natural curly hair down and stays protected with a plaid face mask

Continuing with the green theme of her athleisure, Rumer slipped into a pair of Amazon Green Converse Colors Chuck Taylor All Star sneakers.

Rumer Willis continues her monochrome workout look with Amazon Green Converse Chuck Taylor All Star high-top sneakers

These canvas high-tops are available in fresh colors: Amazon Green, Golden Poppy, and Lemon Chrome. They feature the iconic Chuck Taylor ankle patch, classic woven tongue label and license plate, and OrthoLite insoles.

The Converse Colors Chuck Taylors come in a fresh Amazon Green colorway and have the iconic Chuck Taylor ankle patch and classic woven tongue label

Kaia Gerber’s Post-Workout Style: Birkenstock Arizona Fur Sandals

Kaia Gerber, who’s often pictured attending Pilates class, was seen wearing gray leggings and a black Madhappy Lakers sweatshirt.

Kaia Gerber pairs a black Madhappy Lakers sweatshirt with fitted gray leggings, finishing the casual Pilates look with socks and Birkenstock Arizona sandals

Pulling her tresses up in a casual bun, Kaia kept it low-key with a face mask and The Row x Oliver Peoples BA CC acetate sunglasses ($455).

Kaia Gerber pulls her hair into a casual bun and hides her eyes behind The Row x Oliver Peoples BA CC acetate sunglasses

She carried her Celine Ava tan bag and finished the look with black UGG Leda cozy socks tucked into plush Birkenstock “Arizona” shearling sandals—the winter-ready version of the brand’s iconic two-strap design.

Kaia Gerber grounds her relaxed Pilates outfit with black UGG Leda cozy socks and Birkenstock Arizona shearling sandals featuring the brand’s signature cork footbed and double-buckle straps

The cozy shearling-lined version of Birkenstock’s iconic two-strap sandal is known for immediate comfort, thanks to the soft fleece cushioning the cork footbed—unlike the classic leather Arizona, which typically requires a break-in period.

However, the plush lining can compress with heavy wear over time, especially around the heel and toe. The genuine shearling also helps regulate temperature, keeping feet warm in cooler weather while remaining breathable enough for transitional seasons. Fit can feel slightly snug at first because the lining takes up space inside the sandal, so some wearers size up when wearing thicker socks.

The classic Birkenstock Arizona sandals get a cozy upgrade with soft tonal shearling trims and the brand’s signature cork-latex footbed

Mother-Daughter Style: Rumer Willis in Blue Suede Birkenstocks and Demi Moore’s Minimalist Slip-Ons

The previous week, Rumer spent some time with her mom, Demi Moore, as they were spotted heading to Forma Pilates in West Hollywood. The look-alike duo opted for comfy athleisure for their private Pilates bonding.

Demi Moore and her daughter Rumer Willis head to a private Pilates class at Forma Pilates in West Hollywood on April 5, 2021, dressed in relaxed athleisure and comfortable slip-on footwear

Rumer teamed a pair of teal-colored leggings with a gray cashmere sweater. She styled the look with her usual accessories, including several gold bracelets, a gold necklace, her Apple watch, and her plaid face mask.

Rumer Willis pairs a relaxed gray sweater with teal leggings while heading to Pilates, styling the cozy athleisure look with socks and Birkenstock Arizona sandals

The Once Upon a Time in Hollywood star kept her essentials in a black croc bucket bag and finished off her look with a pair of white socks and worn-out blue Birkenstock sandals.

Rumer Willis pairs white crew socks with blue suede Birkenstock Arizona sandals, embracing the laid-back post-workout styling trend

Her mom, Demi, on the other hand, opted for a black sweater, black leggings, and beige slip-on shoes.

Following the health and safety guidelines, the Ghost actress covered her mouth and nose with a white face mask. She wore her long, straight hair down and kept a low profile with a pair of aviators.

Demi Moore steps out in Under Armour leggings and a black graphic sweatshirt, completing the casual look with minimalist slip-on shoes

More Celebrity Style Moments Featuring Converse and Birkenstock

Rumer Willis’ relaxed Pilates style proves that the right footwear can transform a simple athleisure outfit—whether it’s classic Converse high-tops adding a pop of color or comfortable Birkenstock sandals finishing a post-workout look with effortless ease.