I used my wife?s Sennheiser Game One?s for the test. I only got mosquito bites on areas I didnt spray on myself. My story:1st - I wear a size 11 normally in a medium width weather heels, sandals, or a gym shoe. I typically wear a size 39 in Birkenstocks and the Birki Londons fit exactly as expected. Well now I?m not, I?m keeping both so he?ll have the larger size when the others are too small. they shrank! 290$ total and the jbl charge 4 sounds a lot better. These were a great fix and match the original color of my Powerbeats. Nowadays I do a lot of hiking in a wet, rocky place. I didnt realize from the pictures how beastly the jaws are.