Bit for horse with large tongue / low palate

[Ambrey]

@Iride;3255279

This one is great for horses with thick tongues (the Pessoa Magic Relaxation bit). It is curved, has a copper center, eggbutt cheeks, low port giving room for the tongue, straight bars that don’t collapse (and therefore it’s actually safe for the palate). Has anyone else tried this bit? I ride jumpers so I’m not sure how common/legal it is for dressage; the lady at the store near me said she sells tons of them:

http://www.equestriancollections.com/itemmatrix.asp?groupcode=ER00836&ItemType=MG&source=ChannelAdvisor&utm_source=ChannelAdvisor&utm_medium=CPC&utm_campaign=ER00836&CAWELAID=65487607

Ported bits aren’t legal for dressage

[Iride]

@Ambrey;3255684

Ported bits aren’t legal for dressage

Ah I see! Oh well…
Curious though, why are ported bits not legal?