Alginates and gelling fibre dressings are fibrous, absorbent and conformable dressings that form a gel on contact with exudate. They are both indicated for similar wound types and create a moist environment that promotes autolytic debridement. However, dressing performance differs significantly with regards to absorbency and physical structure of the dressing. This article discusses the physical properties of each dressing type and how they may fit into clinical practice.