Just over a week ago (on May 10, 2005) my new sea kayak finally arrived! 
This is my Dagger Specter 15.5 Airalite kayak. It's 15'-5" (470cm) long and 23.5" (60cm) wide. This a touring kayak, but it's also called a sea kayak. It's made out of a special composite material, called Airalite, which looks like fiberglass. So it's much stiffer and a bit lighter than a poly (polyethylene) kayak. And it's very sleek and shiny, and sexy (Hey, kayaks can be sexy, if sports cars can). My first kayak was a recreational kayak, and this is a performance kayak. It's much longer and quite a bit narrower, so this one is much faster . . . and much tippier. This is NOT a beginner kayak! So it's going to take a bit of getting used to. Just getting in and out of it is tricky. (It's a bit like putting on a pair of jeans.) It also weighs 53 pounds, which is 8 pounds more than my first kayak. I can lift it by myself, but it's a struggle for me, but I won't be carrying it very far. Besides, I usually kayak with my best friend, and we can carry the boats together. (She has this same model, only hers has a yellow deck).
Cockpit and Thigh braces: Another big difference is that this kayak has a smaller cockpit opening, with thigh braces. Ok, so what does that mean actually? Here's a good way to explain this: "You sit in a recreational kayak, but you wear a sea kayak." Sea kayaks are just a much tighter fit. Which is one of the reasons why sea kayaks are made in so many various sizes and models. One size does not fit all. You don't just pick out a sea kayak because you like that way that it looks. You have to find one that fits you right, and that's made for your weight (including the weight of all your gear). It's sort of like buying designer jeans . . . you want something that looks good, but they also have to fit well. Without a good fit, you'll be very uncomfortable. Most sea kayaks have thigh braces, which are necessary for a couple of reasons. 
19x34" Cockpit w/ thigh braces (In the photo above, they are the black curved thingies, just in front of the seat.) They give you a solid place to brace your thighs (kayak terms are sooo logical), and are used to help control your kayak. They are necessary for advanced paddling techniques, such as bracing and rolling.
Bracing and Rolling: Bracing is leaning your kayak on it's edge . . . it's also called edging, or carving. Sea kayaks are long and edging helps you to turn much sharper, much like the way you edge on skis or on a snowboard to turn. Edging also helps you to keep your kayak straight in windy conditions. Rolling is ... well, rolling over . . . like all the way . . . as in 360 degrees. It involves getting wet, because you're actually completely upside down in the water for a while. You really need to have a spray skirt to do a roll. A spray skirt seals your open cockpit. It fit's snuggly around your chest and stretches over the lip that surrounds the cockpit. It keeps most of the water out when you're out in big waves or even if you flip over. Rolling is the skill that allows you to get your kayak back upright again, while remaining in the cockpit. I can edge my kayak. I haven't attempted rolling yet. (I've only been out in this kayak twice so far and only had my spray skirt on once. I'm still learning.) 
My Seals Marina Spray skirt |