I only used them one time so far. I will try again, but I put them on for a 12 mile run. At mile seven I realized they were gone. Very frustrating. When I first put them on I really liked them and hoped to finally find something that would work. Sadly, they didn''t.

They are the best. I have been using this product ever since I started running almost 9 mos ago. It definitely stays on your nipples after a very sweaty run in the middle of a hot humid summer in Austin, Tx. They are easy to put on and take off. They also work great in cold weather too. I highly recommend them over other products that I have heard from other runners. I am so thankful for these as I no longer have sore nipples after my long 20+ mi runs. They were still on me after my 2 marathons this past year. Enjoy your runs with these awesome Nip Guards!!!

Admittedly the concept felt a little odd putting a nipple into a little cavity, but I figured why not. I followed the instructions and kept my hand over them till the adhesive was firmly set, put my gear on and went for a run. After an hour of driving and four hours of running I jumped in the shower and remembered the guards. They were still secured in position just as I left them, faithfully guarding my nips. What more could I ask of a nip guard than that it guard my nips. I''m sold. I''ll be using these things on all my long runs from now on.

Three thoughts on these things: 1) They are, in my opinion a little pricey BUT they work, 2) Not that it would matter but they did not show through my shirt AT ALL, 3) You''ll lose a little hair removing them if you have hair to lose. Not much but enough to say, "ouch."

At first they seemed really flimsy and I figured they were gonna fall off. I was surprised how well they do stick despite sweating

Great product. Stayed on during entire marathon. No complaints at all and Runoutlet was great to deal with. Fast shipping and easy purchase. I would highly recomend both NipGuards and runoutlet.

I begin most long runs more in fear of chafed nipples than sore or tired legs!  I first found & used in mid-2012 and will never run 90+ minutes without them again.  They stay on for hours through sweat, despite hair, and using any shirt I''ve tossed at them for the last year.