Made with 100% balsa wood, a rapidly renewable resource, harvested from balsa trees outside of rainforest areas. Contains no colors, dyes, finishes, harmful glues or fillers. * Lightweight and Strong - Balso wood provides strength and support. The Superlight block is extra light for easy portability * Comfortable - Soft, but not spongy, perfect for supporting poses and aiding alignment and opening your practice. * Made from balsa wood, a rapidly renewable resource. * Through its partnership with Trees for the Future, JadeYoga preserves 100sf of rainforest for every block sold.