Thesidepieceshavebeendevelopedtokeepasnarrowaprofileaspossible,andtoimprovethefittingagainsttheearwhenusingearmuffsatthesametimemakingthespectaclesextracomfortabletowear.
What's a sentence that uses these characters?
The sidepieces have been developed to keep as narrow a profile as possible, and to improve the fitting against the ear when using ear muffs at the same time making the spectacles extra comfortable to wear.