The Myotis" curved edges help to keep it taut. Designed with 15 loops and tie-downs for a variety of pitching options. Comes with two lengths of microcord for securing the ridgeline to trees or to anchor poles. Constructed of waterproof 1.1oz silicone impregnated ripstop nylon. Available in 8" x 8" (14.5 oz) and 10" x 10" (21 oz).