... , they are all water proof, the sponge we use for our products is of high density ... for outdoor use, it need carefully maintenance, but we don't need any cleaners and maintenance products, ... wiped with a damp cloth, if cleaners needed, we strongly suggest you use non-foaming products, Coz ... sets is used to garden and public area. Warranty:We offer three years warranty. Product series: 1,Chair series: ...