Birkenstock Adds Studded Siena, Expanding Its Rivet Sandal Push

Birkenstock is giving its most familiar sandal a little bite. The new Siena Rivet Suede Leather arrives in taupe and black, priced at $154.95 and tucked behind member access, but the bigger story is visual: metal studs are pushing the brand farther into a softer kind of punk, where comfort still leads and decoration does the talking.

The Siena is Birkenstock’s fourth metal-riveted model, and it reads like the cleanest test yet of whether hardware can become a real lane for a brand built on understatement. The sandal still has the easy, open silhouette that made Birkenstock a staple in the first place, but the rivets add a jewelry-like edge that changes the mood immediately. It is less utilitarian campus shoe, more polished street sandal with a little attitude.

Birkenstock is treating that shift as more than a one-off embellishment. The company already has a dedicated Rivets Collection and a separate Introducing: The Rivet Collection campaign page, which signals a broader product push around the idea. Arizona Rivets is already in the market too, with Nordstrom describing it as a contemporary update to the Arizona sandal, a defining style since 1973. That matters because Birkenstock rarely strays far from its core franchises unless it sees room to stretch them commercially and aesthetically.

The brand’s own history gives the move extra weight. Birkenstock traces its shoemaking roots to 1774, and the 1774 line is positioned as an exclusive, collaboration-focused collection made in German workshops. In other words, the company has room for both ends of the spectrum: the purest expression of its heritage and the more decorative version now showing up in the Siena and Arizona families.

The timing also fits the business. Birkenstock reported fiscal 2025 revenue growth of 16 percent and an adjusted EBITDA margin of 31.8 percent, ahead of target. When a sandal company is performing that strongly, even a small design tweak in a core category starts to look strategic rather than cosmetic.

The studded Siena should land with people who already understand the appeal of Birkenstock as a shape, not a statement. It works best with clothes that keep the rest of the look quiet: straight-leg denim, crisp socks, a sharp overshirt, an easy suit cut loose at the ankle. The point is not to turn the sandal into a costume piece. It is to let the rivets catch the light while the familiar Birkenstock footprint keeps everything grounded. That balance is exactly what makes the move worth watching.