Teak
Teak is naturally water-resistant and physically very strong and durable. It is not prone to significant expansion or contraction with humidity changes. The oils in teak are what make it weather-resistant and it requires basically no care when left outside.
Rattan
Rattan is a type of material that is used in wicker weaves. Rattan is a naturally growing vine like species that is native to tropical regions of Australia, Asia, and Africa. For production use, the skin is peeled away and utilized for weaving purposes.