These genuine Symbio F eartips are made by MandarinEs and are their latest creation. After providing incredible eartips with their Symbio W hybrid memory foam and silicone and then the Symbio Peel with just the silicone, Symbio have now launched their Symbio F made completely of memory foam.
These tips offer incredible comfort and isolation without taking away too much from the sound. Often with foam tips it causes the bass to be too overpowering and bloated and the treble can be rolled off too quickly causing the sparkle to be lost. With the Symbio F this doesn’t happen to the same degree as usual foam tips. For many earphones that I have tried them on, it effectively makes them feel and sound like they are custom fit.
It is a great addition to any earphone with a bore size of ~4.5mm.