Fishing boat chairs. No armrests but very comfortable. They also make a high back version. They are cheap and fairly durable. I am on my second one. After about five years of liveaboard use the cushions wear out. It is cheaper to buy a new chair than to re-upholster.

http://www.cabelas.com/product/Tempress-Low-Back-Navistyle-Boat-Seat/737488.uts?Ntk=AllProducts&searchPath=%2Fcatalog%2Fsearch.cmd%3Fform_state%3DsearchForm%26N%3D0%26fsch%3Dtrue%26Ntk%3DAllProducts%26Ntt%3Dtempress%26x%3D15%26y%3D10%26WTz_l%3DHeader%253BSearch-All%2BProducts&Ntt=tempress&WTz_l=Header%3BSearch-All+Products