Although all of our hammocks are designed to withstand outdoor use, some materials are more resistant to rain and sun damage than others. Hammocks that are made from 100% polyester, parachute-silk, or Elltex are all suitable for outdoor use, but we still recommend bringing them inside to dry in order to prevent mold growth. For our Brazilian cotton hammocks, it's best to keep them dry to prevent damage. For more information, please visit our website.