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Tents, hammocks, and tarps with bivy sacks are used by long-distance hikers to protect themselves from insects and weather. Of these, tents are the most common. The development of Dyneema Composite Fabrics, and very lightweight silicone-coated fabrics have allowed manufacturers to produce very lightweight tents. The lightest tents are single wall, but even some double wall tents are very light weight. Weight can be further reduced by using poncho-tarps, or a bivy sack ("Alpine style") as the sole shelter. Generally as weight decreases, the skill needed to shelter safely increases.