How different can two knit flats be? There actually is a distinct difference between the feel, as well as the maintenance, of Everlane's and Rothy's flats.
Rothy's
Rothy's knit material is thinner and slightly tighter-woven, and the 3D printing process that produces it results in a less noticeable pattern. Rothy's round-toe flats have some more give and flexibility, so they could be ideal for wide feet. The pointy-toe version is best for narrow feet. Since the insole is also made from recycled materials rather than something like leather, it feels drier and slightly more breathable, and it won't stick to the bottom of your feet. If you tend to have sweaty feet, Rothy's might be better for you. They're easy to clean — just take out the insoles to hand-wash and throw the shoes themselves in the cold wash cycle of your washing machine.
Everlane
The Everlane Day Glove ReKnit knit material is thicker and fashioned into a rib pattern. The flat also has a thicker, more defined "collar" that hugs onto your foot. The cushioned leather insole is buttery soft, smooth, and flexible, providing all-day comfort reminiscent of the original Day Glove. Together, these components make a lightweight, breathable shoe that you can wear straight out of the box. Due to the leather detailing on this shoe, you can only spot clean it.