One pair of VIVAIA flats uses 6 recycled plastic bottles from city waste and ocean. Then weaved with beautiful treads and knit them into super soft uppers. AN ULTRA SOFT UPPER & SOLE Unique 3D Knitting technology creates uppers that are both flexible and soft. The outsole are creafted using carbon-free rubber that is shock absorbent, anti-slip, and adds a bounce to your step. They have breathability, your feet will stay dry, clean, and comfortable all day. COMPLETELY MACHINE WASHABLE