The best wood for an Adirondack chair is a durable, weather-resistant wood such as cedar, redwood, or teak. These woods naturally resist rot and decay and hold up well outdoors. They are also relatively easy to work with and have a natural beauty that complements the rustic look of an Adirondack chair. Other options include pressure-treated pine or composite materials, resistant to the elements but may not have the same natural look and feel as cedar or redwood. The best wood choice will depend on your personal preferences and budget.