The Happy Seat is an inflatable bladder that goes under your legs just in front of your existing seat. It has two purposes. 1. It gives you more control in the boat. 2. It makes your legs more comfortable, taking some of the pressure off of your knees, hips, and butt.
The Happy Seat comes with a cord to attach the front of it to your floor support, and the back end attaches by Velcro straps around your seat. If you have a Jackson Kayak, then it was designed perfectly for you, however, it will work in any boat. Warning: The Happy Seat takes up room in your cockpit. You should make sure it doesn't impede exit from your boat in case of emergency. You should attach it in properly before using it with the cord included. Don't use it if you aren't 100% sure that you can get out easily.