Our loupes are designed with flexible temple arms. This allows any user to properly fit our loupes onto their head. Adjusting the temple arms limits the movement of the loupe as it prevents them from sliding down the face. If properly fitted, a head strap is not needed.Our loupes are pre-adjusted with straight temple arms. Therefore, we highly recommend adjusting them to fit properly. If not, the loupe may slide down your nose during procedures. By bending the temple arms around the ear, the temple arms act as a hook. This allows the frame to remain in place and avoids sliding down the nose during procedures.