Am pathetically repetitive........always bleat on about creatures of leisure 10' and 12'
Maybe the 12' wraps around ones neck wrists and ankles more than the 10'........but the 12' that I am using at the moment might have a bit more stretch to avoid fin cuts (so far anyway)
On the other hand you see SUP people surfing mavericks with 15' leashes & waist tethering points
If the surf is really big it can seem quite sophisticated to have a brand new leggie you can have an absurd amount of trust in