Boat seat cushion , white w/ grippy straps (sewn) on one side. NOS Perfect Condition. Zipper on one side. Comes with 2 snaps (straps) attached. High Quality foam and material. I don't know exact boat this was for, dimensions:  

53"x14"x2" .. weighs just over 3 lbs. 

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Item will ship within One Biz Day from purchase, USPS Priority