This book provides an in-depth exploration of the development and application of smart wearables, nanofibers, and sustainable textiles. It covers advancements in energy harvesting, health monitoring, and sustainable design, offering readers a holistic understanding of the intersection between wearable technology, advanced materials, and environmental responsibility. Explores the challenges and prospects of integrating energy harvesting and storage into smart wearables. Discusses the role of artificial intelligence and machine learning in enhancing the functionality of wearable devices. Highlights innovations in textile-based sensors, conducting yarns, and eco-friendly photonic and fluorescent materials for wearables. Examines the use of synthetic and biopolymer nanofiber films in food packaging and their implications for sustainability. Provides insights into sustainable textile processing and the future of eco-carriers in green diffusion. By presenting state-of-the-art research and technologies, this book serves as a valuable resource for researchers, engineers, and professionals, including materials scientists, textile engineers, and biomedical engineers.