ECO glasses provide stylish prescription frames that are environmentally friendly. The company is the first and only brand that has produced a glasses and sunglasses collection made with 95% recycled materials. All ECO biobased glasses frames are constructed with a functional yet invisible spring hinge, allowing for a more comfortable, lightweight fit. The temple tips are adjustable, with a stainless steel core and anti-slip finish. All ECO glasses and most ECO sunglasses can be customized with prescription lenses, just like all of our glasses and sunglasses.