As soon as I received Seawave 2 last year I ditched the heavy and squidgy Gumotex seats (right), and implemented my proven packraft inflatable seatbase + SoT backrest idea (left and below right) at a fraction of the weight and bulk.
The seatbase is fine of course; it weighs next to nothing and lifts you off the unavoidably soft floor for a good ‘raised-bum’ paddling stance. I’ve been using it for years, but sometimes I think I could use more back support than the SoT foam backrest. It presses nicely into the small of the back, but like a low-backed chair, is not something you can lean on. You could say in a kayak you shouldn’t be leaning on anything, but sitting bolt upright, knocking out a series of ‘searchlight beam’ torso rotating powerstrokes. But after too much of that you just want to lean back on something.
I picked up a used BICSport Power Backrest (for an SoT; right) which looked like it might be more comfortable. At 37cm, it was tall but lacked a hand rear pocket and instead had a centrally positioned adjustable bungy to counter-tension the back and keep it upright. Using it for the first time on the Wey last week, it started well but after a few hours collapsed as the pull from the front and back straps crumpled the backrest.
The problem: lack of stiffness. A backrest needs to be stiff like a chair back, while a seatbase wants to be soft like an armchair. One provides support; the latter takes your weight. The best way to fix the backrest was to insert a firm plastic plate. It just so happens I kept that very part from a rotting old Aire Cheetah seat bought 15 years ago for my Sunny.
I got that boat back last year, did it up with new seats and sold it. How’s that for recycling!
To be honest I’m beginning to think separate backrests and seatbases are a bit of a faff to fit and especially seatbase just right when getting in and out a lot (did someone say ‘Wey‘?). It wouldn’t be hard to attach the packraft seatbase to the BIC back rest.
I bought another Chinese cheapie IK seat (left; with back pocket; about £25) as I did for the refurb’d Sunny. I was considering semi-permanently attaching the packraft base underneath it with some sort of net arrangement, but I see the all-important backrest is just more mushy foam so also needs stiffening to work for me pushing against footrests. It will work fine as a second seat.