Choosing a tarp is somewhat based on individual needs and what kind of weather conditions you expect. With that being said, for our Draumr hammocks, we do not recommend a tarp shorter than 350cm (from head to toe) and 250cm (along the ridgeline). The dimensions of our newest tarps, Skjold 10 and Skjold UL, is 380 x 300 cm. The bigger tarp is a result of feedback from customers and our own experiences when camping.