Wet v1
Wet V1 is sopping condsideration on a wet / contaminated runway. V1 is stop / go consideration speed. With wet V1 you must consider continuing the T/O knowing you insufficent braking action to stop but still haven't accelerated to a go decision yet. Whereas V1 is a stop/go speed.
It can be somewhat confusing...tyr to thing of it as being a fix for a wet runway that will allow you calibrated stopping distance .