I ordered these sunglasses specifically for sports.  I play tennis in the hot, humid South.  My trouble with other sunglasses is that they fogged up too much in the humidity and once my lenses got fogged or wet or I tried to wipe them-- I could not get them free of sweat and humidity.  But I don't have that problem with the Tifosi sport sunglasses.  I am very pleased with the purchase and the product.  I have played tennis in the hot, humid mornings and the hot, humid evenings.  I have not had a problem with these glasses getting fogged with humidity.  I tend to sweat a lot - so there is the occasional bead of sweat that will get on the lense--but I am able to wipe it away and not have the lenses continuously fog back up when I put them on.  I love these sunglasses.