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Find a piece · Knit mary jane flat

The slipper company put a strap on it.

Birdies started life making slippers glamorous enough to answer the door in, and every shoe they have shipped since carries that origin story in the footbed. The Hummingbird is the mary jane of the family: the house's soft, cushioned construction with a strap across the instep, which is the single detail that turns a flat from something your foot hopes will stay on into something that simply does.

The strap deserves more credit than it gets. It anchors the shoe through a full commuting day, it lets the vamp sit lower and prettier because it isn't responsible for grip, and it flashes a little schoolgirl irony that plain ballet shapes can't manage. Combine that with a knit-built upper's give — no break-in period, no heel-chewing fortnight — and you have the rare precious-looking shoe that behaves like loungewear.

The washable-knit flat is now a two-house rivalry, and honesty requires saying so: the other house makes the closest competitor, and the gap between them is only twenty-five dollars.

The piece

Knit mary jane flat

Birdies — Women's The Hummingbird Mary Jane

$150at Bloomingdale's

Find it for less

Rothy's — Women's Max Buckle Knit Mesh Mary Jane Flats

$125— the rival knit mary jane, machine-washable and made from recycled bottles, at 17% less — the narrowest swap gap we print, because this category's two serious players price nearly shoulder to shoulder. Rothy's knit runs springier and cooler; Birdies' build runs softer underfoot. Either way the strap does the keeping-on

at Bloomingdale's

Where it goes

The strapless version of this argument lives at the ballet flat, argued from the ground up.

For the dressed-up end of the mary jane spectrum, a buckled flat that treats gemstones as hardware makes the evening case.

For the same comfort argument in a closed loafer, an almond toe that never dates is the shoe.

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