I Found the Elusive "Cool Socks" All the Trendy Kids Are Wearing

Adidas Women's Cushioned Quarter Socks ($12-$16)

If you're OK with a logo, this Adidas option is fantastic. The cushioning and arch compression really does make a difference when you're walking long distances or working out, and they're perfectly thin without being flimsy. One Amazon reviewer (not me) even said: "These are the perfect socks if you don't want the Gen Zers to know you're old! These are super comfy and true to size!" (Gen Z will know. But at least they'll think you have good style?)