if you will look at the pictures that you have posted,you will see the marks of the flea collers on his ankles.the reason being that he wore them under his sock TIGHT against his skin.i wear mine loosly on my ankles so they can slide up and down your skin and are NOT tight against the skin.i dont think the solder was getting then washed off in the water either.mine is washed of all the time im in the water and move around on my ankles.they get wet,dry off then get wet and move around.deet, that you rub, in is in contact with your skin for a longer time than the flea collers.i wear them for 3 weeks straight every year ive gone to jamaica.(20 years).without a single incident.and no bites. i write this every year you put those pictures up.a lot of people that i know have done this and have written me to thank me for the relief that they have gotten from the collers.so you can say no,no no,but i speaking from many years of wearing them,say yes ,yes,yes,as long as you wear them loosly.you might want to try them too,so you could speak from experience.i KNOW what im talking about.