Normal sized prussik has always served me well. Also you can wrap the sling around your foot a few times to stop it slipping off.
Or you can wrap the rope around you foot a couple of times instead of using a Prussik if you only have one or jus want to quickly gain a few meters.
OP: You can always extend them with cord or slings. Better that you're able to improvise with what you have than that you have 'perfect' kit.
Same size. Have two prusik loops of equal length then you don't have to worry about which is which. You can extend a foot loop with a sling.
P.S. Congratulations on spelling it right!
Prusik is spelt with a capital P:-)
> Prusik is spelt with a capital P:-)
Punctuated with a capital 'P'. But spelt 'prusik'. :-)
Loops are the same length, but extend the foot one with the widest tape sling you have. A normal cord will practically cut your foot in half in rock boots very quickly.
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