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Does what I need. I used them on my trip to Antarctica where there were strong winds especially when on the water and the sun/reflection was intense so needed shades (polarised, in case anyone is planning on going!) but also needed my hands free to hold on to cameras and phone and securely getting in and out of mini zodiac boats - I could just let my glasses fall off around my neck without any issue**I think only on one occasion there was the risk the glasses could blow off over my neck even with the straps on, during extreme wind, but for most people I'm not sure they will get to that level of wind