This one-piece injection molded plastic armchair adopts unique diamond-shaped hollow perforations on the curved backrest. The hollow structure achieves excellent air circulation, effectively solving the problem of stuffiness during long-time sitting. Crafted from high-density reinforced engineering plastic blended with UV stabilizer, the chair features outstanding waterproof, sun-proof, anti-fading and anti-aging performance, suitable for indoor daily dining use as well as outdoor courtyards, balconies, terraces and open-air catering scenarios. The ergonomic curved back fits the natural curve of the human spine to deliver targeted back support. Integrally formed open armrests offer stable arm placement to relieve shoulder and arm fatigue. The whole chair supports stacked nesting storage to save space when idle, perfectly matching cafes, dessert shops and restaurants that need frequent space rearrangement. The matte anti-stain surface is easy for daily maintenance; beverage spills, food residues and surface dust can be wiped off quickly with a damp cloth. Anti-slip protective foot caps at the bottom of chair legs prevent scratches on wood floors, tiles and laminate floors and reduce sliding noise. Simple modern streamline design coordinates well with Nordic style, modern minimalist and casual outdoor home decoration styles.