These are comfortable but way too big to use with the Calmer Performance so this rendered them useless. Definitely size down if buying for Calmer Performance as the part that is inserted into the ear canal is inflexible.

Very comfortable and of good quality. Fits well.

It's several ears that I regularly purchase spare Earfoams earplugs for either my Flares HD and Flares Jet II. This far they always proved the best in terms of comfort, feeling and durability. They seem to be made of a better quality foam. I also have a Truthear IEM for which I purchased some Inair spare earplugs as the nozzles are too big for the Flare Earplugs to fit. Well, they're close to crap. Annoyingly sticky and last nothing but are more expensive that Flare's ones.
A pity that Flare still didn't elect to produce Earfoams with different nozzle diameters and enter the market of 3rd party earplugs.