Liewood Otto Swim Pants Sea Creature Sandy Mix. Children´s swim pants in recycled polyester. The ideally fitted Otto Swim Pants are perfect for combining with a swim tee for the ultimate sun protection. Ultraviolet Protection Factor 50+. From every meter of swimwear fabric, 35 PET plastic bottles have been reused and spun into yarn. Using recycled PET instead of new PET reduces the amount of raw oil used, ultimately sparing the earth’s scarce resources. Tested and passed for not fading in chlorinated water according to test standard: ISO 105-03: 2010.