my legs used to get covered by sand flea bites.it would ruin my vacation.then i thought about dog flea collers,and tried them.you put them on loosly so they can slide around on your ankles,even where them in the water.now i can walk the beach at night without getting one bite.lot of ppl think it will put poisen in your legs,but it washes of in the water so IF it is poisenious.it comes off.and in the last 20 years of going to jamaica,not one bite.i even took them of the last week i was in jamaica once to see if it was indeed the fleacollers that prevented them from biting me,and i had about 50 bites when i went home,so they DO indeed work for me.many ppl have wrtten to me thanking me for the tip.saying it also worked for them,so try it once and see for your self,it DOES work for many,and we are still alive. now i put them on when i get to my room,and leave them on till i get in the taxie to go home