The 3 pre-laminated composite layers consist of 2 airtight PVC sheets bonded to a Polyester 1000D fabric to create one super strong shell. This shell is then machine laminated directly onto the 500D Polyester Drop Stitch fabric. The pre-lamination and the composite structure create an unprecedented weight/stiffness/durability ratio ever produced in an inflatable SUP. The SE 3DS boards are offered in 6” thickness, with the exception of the SurfAir 9’7”x32” (4” thick).