I will start with the smallest footsize and go up in size.
- Finis Mermaid: EU 33 => 36
- Finis wave: EU 32 => 39
- So Dive Triton: EU 34 => 38
- Leaderfin Sport: EU 37 => 39 (M in soft)
- So Dive Hydra: EU 39 = 43
- Finis Rapid: EU 40 => 44
- So Dive Minos: EU 44 => 48 (I don't have this one)
Here you can see those monofins on top of each other to compare the size of the blades:
* per footsize:
- Wave & Triton:
- Leaderfin & Wave:
- Leaderfin & Triton:
- Rapid & Hydra:
* per brand
- Finis:
- So dive: