what is the envelope of a hot air balloon made of
Hot air balloon Modern hot air balloons are usually made of materials such as ripstop nylon or dacron (a polyester).[19]
Lei (garland) A lei (nā lei is the plural in the Hawaiian language) may be composed of a pattern or series of just about anything, but most commonly consists of fresh natural foliage such as flowers, leaves, vines, fern fronds, and seeds. The most commonly used flowers are those of plumerias, tuberose, carnations, orchids, and pikake, though maile leaves, ferns, and tī leaves are extremely popular as well as traditional among hula dancers. Other types of lei may include sea or land shells, fish teeth, bones, feathers, plastic flowers, fabric, paper (including origami and monetary bills), candy, or anything that can be strung together in a series or pattern and worn as a wreath or a necklace. The Hawaiian Island of Ni‘ihau is famous for its lei made of tiny gem-like shells.[3]