The stoneware comes from a village in the Oberlausitz in Saxony, the knitwear from Arequipa in Peru. Both are designed in Berlin. As a designer, Eliza Helmerich worked for icons like Vivienne Westwood before starting REH of her own in 2015. For most of a decade, she has written, new customers have told her about pieces they bought as stoneware that were nothing of the kind. In 2024 she published a guide on telling stoneware from earthenware.

REH's stoneware comes from Töpferei Thomas Thunig, a pottery in Schmölln-Putzkau, a village near Bischofswerda in the Oberlausitz. Thomas Thunig's father opened the workshop in 1976; after 1989 he returned to his old trade as a stonemason, and his son took over. Around ten people work there today, several of them trained in the house, and every pot is still thrown, painted and glazed by hand.

For REH the workshop makes two collections of Helmerich's design: Polar, matte black and white, from 2015, and Singular, grey and unglazed, from 2021. The pieces carry the names of Bauhaus and modernist ceramicists and artists, Beuys, Burri, Wildenhain and Marguerite among them. Each one is thrown individually, so no piece comes out exactly like the next. The speckle on some surfaces is iron pyrite in the clay, turning metallic in the fire.

The knitwear is made in Arequipa, Peru. The core of the line is baby alpaca: sweaters, cardigans, beanies and scarves, joined by felted cashmere and merino pieces and a small jersey line in organic cotton.

Helmerich keeps the runs small and restocks slowly rather than holding stock in depth; she has written that she wants to avoid overproduction. When a size sells out, orders move to email, or to the studio, which opens by appointment. REH also supports Ayudame, a children's charity in Arequipa.