KEF is a British company that produces high-end audio products, including HiFi speakers, subwoofers, architecture speakers, wireless speakers, and headphones. It was founded in Maidstone, Kent, in 1961 by a BBC engineer Raymond Cooke. From Wikipedia
Nothing’s first over-ear headphones feature a KEF collaboration for Hi-Res Audio with active noise cancellation in a transparent retro-futuristic design backed by up to 35 hours of battery life.