See this Red Paddle 9'2" (x30") Surfstar - makes you think twice about iSUP
Paddle boarding CZ in Peniche Portugal.
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this board is very stiff: can get inflated up to 25 psi (whereas most only can have 15-17psi) and 2 lateral sail battens (3 foot long) are added for additional stiffness in the center.
The overall 4inch thickness will be a handicap in waves - but the pictures show enough performance and fun.