If you haven't already noticed, I am a bit obsessed with fitness gear. I love my heart rate monitor so much, but when I get overly sweaty, it does have the tendency to slip down my torso.
Several companies have caught on and made sports bras with heart rate monitors built into them, but Polar has created the Heart Rate Bra ($34.95), a bra that enables you to slip the transmitter belt into it when you want. You can also take the transmitter out when you don't want to use it, making this bra very versatile. The sports bra itself is made from Dry Wear technology that wicks moisture away from your body and the contoured shoulder strap with a deep T-back makes it a comfortable fit too. If you've ever suffered from your transmitter rubbing your skin the wrong way (ouch), then you may benefit from this bra as well. You can buy it from Amazon.com. Buyers beware: Transmitters are not included with the bra purchase.