Cupsty collapsible cups are made of recyclable plastic which makes them eco-friendly as well. FDA certified platinum food-grade silicone is used along with FDA-grade polypropylene, which makes it temperature-safe and microwave-friendly as well. It is pertinent to mention that our cups are free of BPA, BPS, Lead, and adhesives. We also comply with ISO 9001 and ISO 14001 standards.