Both IFR candidates and instrument-rated pilots will love the sleek, comfortable design of the BLOCKALLS IFR View Limiting Device. In addition to their barely there weight (less than 1oz), these shades feature a comfortable rubber nosepiece for extended wear and streamlined temple tips that easily slide beneath headset seals for quick, no-fuss donning and removal. Additionally, they are much more effective at blocking out sunlight glare than the white, frosted offerings on the market. The eye slits have also been optimized to allow users to easily view the instrument panel while effectively blocking outside visual reference. A stylish, affordable, comfortable training tool that CFIIs, IFR pilots, and instrument rating hopefuls are sure to adore. Blockalls can not be worn over prescription glasses.