You don't have to go outside to realize it's been a scorch fest as of late. And according to meteorologists, the 90-degree temperatures and high humidity levels aren’t letting up anytime soon. The top-heavy distress and closed-in design of over-ear headphones are too unbearable to move around with during any heat wave, especially when you have sweat dripping from the dome and damaging the fabric on your sound cans. Needless to say now is the time to invest in a good pair of in-ear headphones. Having tested the best on the block, we've assembled a collection of lightweight (and inexpensive) sound blasters that’ll surely feed your audio addiction and help you piggybank a few bucks for next month’s Con Ed bill. Tune your hearing to the 15 Best In-Ear Headphones Under $100.