Negative fins, lightest of the heavy?

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I’ve been using the go sports for several years and really like them. I mostly frog kick and they are comfortable and work well for this.

But when I did Fundies, my instructor showed me the video of how much they flex on flutter and I struggled to stay in trim when back kicking.

I’ve now got RK3HDs for my drysuit and the difference is amazing. It’s so much easier to stop, back kick while staying in trim, helicopter turn, and makes fine movements and adjustments more precisely than the go sport. All while feeling just as good with the frog kick.

Not sure if the HDs will be too heavy in wetsuit, but for me they feel great in my drysuit.
 
Tried on the RK3 and pocket was short, lots of heal hanging out on large and super. Any recommendations?
 
Tried on the RK3 and pocket was short, lots of heal hanging out on large and super. Any recommendations?

Boots with fairly stiff soles are the best you can do. IMO, not providing heel support is a design flaw. I won't use fins like that.
 
Boots with fairly stiff soles are the best you can do. IMO, not providing heel support is a design flaw. I won't use fins like that.
I didn’t buy them, still shopping passes because of fit.
 
I’ve been using the go sports for several years and really like them. I mostly frog kick and they are comfortable and work well for this.

But when I did Fundies, my instructor showed me the video of how much they flex on flutter and I struggled to stay in trim when back kicking.

Some fins are designed to flex when flutter kicking. Properly done it will lead to a much more efficient stroke.

Again, fin design is about tradeoffs. For example, fins that are ideal for a fundies class would be terrible for a freediver, and vice versa.
 
Wear an eddy on one foot, XT on the other to feel the difference, spending adequate time learning to adapt
 

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