Suggestion strategy:
Shell size:
Determined by measured foot-lengths and selecting next shell
Shell volume:
Determined by statistic category of foot-widths:
normal, wide, narrow, ...
Customization for skill-levels:
“Advanced” instead of “Sportive”:
Shell sizes around one size larger
Shell volumes slightly wider
“Beginner” instead of “Sportive”:
Shell sizes around 1.5 sizes larger
Shell volume about one category wider