Dwinguler Kids Sofa - Lime Green Your kids will have their own little seating with the Dwinguler Kids Sofa. The sofa has a SOFFKIN synthetic leather outer cover that is soft and lovely. Inside, the sofa has bio-foam that is made from natural vegetable material. What you get is an eco-friendly sofa inside and out. The rounded ergonomic design of the sofa is comfortable for children and helps encourage good posture in them.