Medalist (A+):

1. Shell: Hi Modulus UD Prepreg carbon fiber sandwich construction, with Nomex honeycomb core. High temperature curing resin, heat cured in mold
2. Shoulders: Ribless Feature
3. Inside structure: Carbon fiber seat deck

International (A):

1. Shell: Laminated sandwich construction, with honeycomb sandwiched between Kevlar exterior and carbon/Kevlar interior, with additional carbon fiber reinforcement on gunwales. Heat cured in mold
2. Shoulders: Carbon fiber
3. Inside structure: Carbon fiber seat deck

Competitor (B):

1. Shell: Laminated single skin construction, with fiberglass exterior and carbon fiber interior, with additional carbon fiber reinforcement on gunwales and keel. Heat cured in mold
2. Shoulders: Carbon fiber
3. Inside structure: Carbon fiber seat deck

Club Racer (C):

1. Shell: Laminated single skin construction, with fiberglass exterior and Kevlar interior, with additional carbon fiber reinforcement on gunwales and keel. Heat cured in mold
2. Shoulders: Carbon fiber
3. Inside structure: Kevlar / fiberglass seat deck

Club Racer (D):

1. Shell: Laminated single skin construction, with fiberglass exterior and interior, with additional carbon fiber reinforcement on gunwales and keel. Heat cured in mold
2. Shoulders: Carbon fiber
3. Inside structure: Fiberglass seat deck

B, C and D racers have impact resistant shells(IRS construction). The shells have plastic properties and do not break when for example a boat hits the dock during launching