When you receive your Sleeep earplugs, you will find a pair of Standard size Earfoams which fit onto the stem of the product. Depending on which model you have, a spare set of Large Earfoams will also be included. Start with the Standard size (green) and work your way up to the Large size (red). Use the Earfoams that are most comfortable and fit you the best.
It is crucial that the Earfoams are correctly fitted on Sleeep and that they are correctly fitted in your ears to ensure maximum attenuation and of course, maximum comfort!
Here is a short video that shows how they should be fitted: