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Product Description
At the intersection of strength and sonic performance, IKKO’s OH1 IEM is a solid listening solution for any setting. Each earbud features a hybrid driver array consisting of a Knowles 33518 balanced armature to handle high frequencies, as well as a 10-millimeter, titanium-diaphragm dynamic driver for low and mid frequencies Read More
I bought these on Amazon. IMO they're great but quick head movements made them shift out of my ears, even with well fitting tips, silicone or foam. Rocking my head to a song makes them come out sometimes so I'd assume exercising would be worse.
There are three things that hold IEMs in during movement: 1) they hook over your ears - that's why there's a bend in the cable; 2) the shape of the driver housing conforms fairly well to the inside of your ear; and 3) the tip should be fairly solidly in your ear, forming a bit of a seal. Between these, good IEMs will tend to stay in your ears during moderate movement, but they don't necessarily do well with quick head movements.