Sizing & price,
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This review is from: Comply Tx-100 Isolation PLUS Earphone Tips - (Large) Black (Electronics)
Although I bought large I do find they can 'ooze' out of my ears. You twist them tight to fit them in to your ear but as the memory foam effect takes over they expand and in my case slip out. This is a tad disappointing. so maybe I should buy XL if they do such a size. I see from another review that there is a TSX model which might be the answer for me.
I also think at about c.£6 a pair once you pay postage these are not cheap for two bits of foam.
Apart from having to push them back in they do the job and are reasonably comfortable.