Bolle Bolt Sunglasses are a semi-rimless sports style for an even greater field of vision and also even more lightweight with less frame for added comfort. The usual excellent technical additions from Bolle are what set these sunglasses apart from others. The Thermogrip brow bar. temple tips and nosepieces prevent perspiration from getting in the way, and keep the frames secure and of course comfortable. The nosepieces are adjustable and also the B-Clear oleophobic and anti-fog treated lenses are interchangeable.