It is important to have the right-sized ear fittings and place them correctly in your ear. The earbuds are supplied with seven different-sized plastic ear fittings (S,M, L, XL + three narrower pieces better suitable for use during sleep ). Try which one feels most comfortable for you. When you place the earbuds use the Left and Right signs and JOY logo in them to get them in the right position. When the R/L is above the logo and horizontal, you have placed them correctly.