Each pair of Compression Socks is made using 2 recycled plastic polyethylene terephthalate (PET) bottles through DA.AI’s innovative plastic reclamation process. If you experience muscle fatigue, discomfort, or swelling in your calves, or have a family history of varicose veins, these compression socks may help. Using an advanced 3D knitting technique and ergonomic design, the compression bands that wrap horizontally around the calf muscle aid circulation and provide relief from fatigue, swelling, and more. Originally created to aid burn survivors, DA.AI's compression fabric has continuously evolved over time. This compression cloth is therefore light, thin, and highly breathable. This special knit uses 63% recycled polyester reclaimed by DA.AI, mixed with Spandex and nylon. Horizontal compression bands were created through 3D helical knitting technology combined with an ergonomic design. Supports regular blood flow for reduced swelling, calf fatigue, and risk of varicose veins. Ideal for those who work standing up or seated for extended periods. This next-generation compression fabric is thin, light, and breathable. Fabric: 63% Polyester (DA.AI Recycled) + 22% Nylon + 15% SpandexSize: XS, S, M, L - Please refer to size chart in photo galleryColors: Black/WhiteMade in Taiwan Maximum EfficiencyResources Saved as Compared to Conventional Methods: Water (fl oz): 186 Fossil Fuel (fl oz): 1 Carbon Dioxide (g): 127 Care instructions: Hand Wash Cold Do Not Dry Clean Do Not Bleach Do Not Tumble Dry Do Not Iron Hang Dry Compassion Technology Series When Tzu Chi volunteers travel into disaster areas to provide their aid, DA.AI provides essential items like this backpack to keep them safe and maximize productivity. Placing function first is an absolute must, and these items are reliable when the going gets tough. Recycled and eco-friendly materials are used wherever possible.