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Vor - und Nachteile:

1) Single Layer
+ Light weight
+ Easy to roll
- Looses shape
- Easier to leak / not airtight
- Flexible / not stiff
- Easy to damage / not durable*
- Twists

2) Double Layer
+ Stiff
+ Keep shape
+ Durable
+ Airtight
+ Able to prevent Twist
- Heavy
- Cosmetic blemishes
- Harder to roll

3) Fusion
+ Light weight = e.g. X 12.6 is 2kg lighter than Double Layer
+ Stiff = 25-30N/mm deflection (same stiffness as double layer)
+ Keep shape = especially Rocker
+ Durable = More rigid PVC* (tougher)
+ Airtight = Heat fused*
+ No cosmetic blemishes = no bubbles when rolling*
+ No Twist

Hat mir mal ein Produktmanager geschrieben, der seit Jahren ISUPs entwickelt in Asien.