Read reviews for the Standard Sit-On-Top Seat by Harmony Gear as submitted by your fellow paddlers.
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I bought this for my sit-in Kayak, based on customer comments on "Dick's" website. It is made well, with plenty of back support. The seat is a bit thin. The back support is a bit wide for my sit it, but it works. For less than $40 I think its a decent not great addition.