Characteristic of the permanent collection of Koeka is that it is "never out of stock". This means that these products are always in stock and can therefore be delivered quickly. This permanent collection is regularly expanded with new products and colors. In addition, Koeka designs a changing summer and winter collection every year. Koeka still uses terry cloth frequently for its basic collection. Waffle and canvas are also popular fabrics. Flannel and teddy are used a lot for the lining.