The Seals Tandem Kayak Cockpit Cover is constructed with medium-weight coated nylon pack cloth to keep the critters out of your kayak during storage.
This cover fit ok on my Pamlico 135T cockpit. It was a little loose, which was just a bit problematic since I trailered my kayaks about 1200 miles (round trip) on their sides, cockpits out. The cover on my Sundance 9.5 (also Seals) fit much better, and never came loose. This cover on my Pamlico 135T came loose once, and was slack enough that it billowed quite a bit while I drove. I added a strap all the way around the kayak in the middle in addition to the two straps that came with the cover. Overall I was pleased, however, and the cover is still in good condition after my trip. For its generally intended purpose of keeping stuff out of the kayak during storage, its superb. (It won't work if the kayak is stored outside with the cockpit facing up, as the cover would probably pool with rain and sink in.)
Well, it fits as advertised; it DOES fit the Pamlico 135T, a difficult-to-fit large cockpit, and snuggly, so you don't have to worry about it blowing off in transit, especially with the 2 included straps. That said, it is a decidedly inferior product to the Harmony cover: Harmony's cover has access to the bungee cord, so you can tighten to your heart's delight; the Harmony cover has THREE straps, and they are SEWN IN, NOT loose as in the Seals cover. Yes, Harmony is $15 more, but in this professional mariner's opinion, WELL worth the extra cash. Seals does the basic job for less, but for a few extra clams you get a FAR BETTER PRODUCT.
Great cover --fit perfectly!
We bought this cover for a LL Bean Manatee 14.5 Tandem kayak, and it is well made and works well. It can be frustrating to install given how large the cockpit hole is on a tandem kayak but with a little practice it's not hard at all. I've only owned it for a month, so I don't know how long it will last but it appears to be made of very high quality parts.