The rain cover for HP seat systems is made of blue ripstop nylon – so your seat stays dry after a rain storm. You can always have the “little blue” with you, it can be rolled or folded narrowly and then easily fits into the Microbag for the BodyLink seat or the backrest of the ErgoMesh seat. With the ErgoMesh Premium seat we have even provided a separate “drying compartment” for the covers.